please helpp me easy 20

Of the following, which is an infectious disease?

a.

asthma

c.

diabetes

b.

tuberculosis

d.

heart disease

Please select the best answer from the choices provided

Mechanical and chemical digestion begin in the ___.

a.

mouth.

b.

liver.

c.

stomach.

d.

intestines.

Please select the best answer from the choices provided

____ connect the muscles to the bones.

a.

tendons.

c.

a flexor.

b.

an open muscle.

d.

an extensor.

Please select the best answer from the choices provided

There are three types of blood.

Please select the best answer from the choices provided

Infectious diseases are caused by ____.

a.

viruses

c.

bacteria

b.

fungi

d.

all of the above

Please select the best answer from the choices provided

__________ allows the skin to bend without tearing apart.

a.

collagen.

c.

epidermis.

b.

nerve ending.

d.

none of the above.

Please select the best answer from the choices provided

An organism’s particular role in its habitat, or how it makes its living, is called its

a.

carrying capacity.

b.

ecosystem.

c.

competition.

d.

niche.

Please select the best answer from the choices provided

In which situation would it be 
least likely for a scientist to revise her experimental methods?

if her results support her hypothesis
if her data do not support her hypothesis
if no conclusions can be drawn from the data
if results are the same after repeating the procedure

An organism that is able to produce its own food is called a(n):

a.

autotroph

c.

heterotroph

b.

metatroph

d.

phototroph

Please select the best answer from the choices provided

A Russian citizen has illegally obtained a Siberian tiger and is trying to sell the tiger’s fur in the United States. What treaty does this violate?

Tiger Treaty
Lacey Treaty
CITES
EPA

Tiny finger shaped structures in the small intestine that helps absorb large amounts of nutrients are called ___.

a.

villi

b.

pancreas

c.

liver

d.

gallbladder

Please select the best answer from the choices provided

The main function of the excretory system is to ____.

a.

protect the brain

b.

strengthen skeletal muscles

c.

bring carbon dioxide to body cells

d.

collect and remove wastes from the body

Please select the best answer from the choices provided

Please select the word from the list that best fits the definition

Breaks down fats, starches and proteins and absorbs nutrients into the bloodstream

small intestineliverpancreaslarge intestine

Chicken pox is a virus that causes an itchy rash but typically does not have any major or lasting effects on an infected person. Before 1995, chicken pox parties were popular. In a chicken pox party, healthy children were brought around children who were sick with chicken pox so that they would be exposed to the virus and their immune system would learn to fight it. A vaccine for chicken pox was developed in 1995, and chicken pox parties are now rare. What best describes how vaccines have advanced science? 

Vaccines are more effective on ethnicities that are highly susceptible to a disease.
Vaccines can determine which genes can cause disease.
Vaccines can minimize lifestyle choices that allow for greater exposure to a disease.
Vaccines allow for building immunity without harmful exposure because not all viruses are safe to be exposed to.

Please select the word from the list that best fits the definition

System that collects and removes waste from the body

excretory systemexcretionnephrons

Which of the following stimulates a person’s body to produce chemicals that destroy viruses or bacteria?

a.

antibiotic

b.

vaccine

c.

toxin

d.

endospore

Please select the best answer from the choices provided

Please select the word from the list that best fits the definition

Consists of the brain and spinal cord, and acts as the control center of the body

reflexperipheral nervous systemcentral nervous systemnervous system injuries

Which best describes the negative impact of human water use? 

Food can be produced in dry areas.
Increased runoff carries fertilizers.
Food can be produced through drought years.
Water can improve the livelihood of farmers.

The major organs of the skeletal system include:

a.

connective tissue

c.

cartilage

b.

bones

d.

all of the above

Please select the best answer from the choices provided

Which of the following describes symbiotic mutualism?

a.

one organism benefits

b.

one organism is harmed

c.

both organisms benefit

d.

both organisms are harmed

Please select the best answer from the choices provided

Why are viruses like parasites?

a.

They harm the cells they enter.

b.

They multiply.

c.

They use their own energy to develop.

d.

They make their own food.

Please select the best answer from the choices provided

At the early stage of development, an organism is called a(n) _____.

a.

embryo

c.

vertebrate

b.

invertebrate

d.

consumer

Please select the best answer from the choices provided

What makes up the central nervous system?

a.

motor neurons.

b.

interneurons.

c.

brain and spinal cord.

d.

liver and pancreas.

Please select the best answer from the choices provided

Cells that identify the hormone’s chemical structure are called _____.

a.

nerve cells

b.

target cells

c.

blood cells

d.

none of the above

Please select the best answer from the choices provided

The soft tissue that is contained within a bone is called ____.

a.

cells

c.

spongy bone

b.

mineral

d.

marrow

Please select the best answer from the choices provided

oxygen and nutrients are carried through the body by the lungs.

Please select the best answer from the choices provided

The body’s reaction to a change in the environment is called a response.

Please select the best answer from the choices provided

Changes in population size can be caused by:

a.

immigration

c.

birth rate

b.

weather

d.

both a and c

Please select the best answer from the choices provided

Consider the formula for glucose: C6H12O6. What does this indicate about the relationship of the reactants to glucose?

Twelve water (H2O) molecules were used to make it.
Twelve hydrogen (H2) molecules were used to make it.
Six oxygen (O2) molecules were used to make it.
Six carbon dioxide (CO2) molecules were used to make it.

Your immune system consists of ____ that fight disease.

a.

cells

c.

organs

b.

tissues

d.

all of the above

Please select the best answer from the choices provided

The place where an organism lives and that provides the things the organism needs is called its

a.

habitat.

b.

population.

c.

species.

d.

community.

Please select the best answer from the choices provided

The more classification levels that two organisms share,

a.

the closer together on Earth they live.

b.

the easier it is to tell them apart.

c.

the more characteristics they have in common.

d.

the more distantly related they are.

Please select the best answer from the choices provided

The two lower chambers of the human heart are known as:

a.

atriums

c.

auricles

b.

ventricles

d.

blood vessels

Please select the best answer from the choices provided

Consider the example of shivering when a cold wind blows. The wind would be referred to as the _____________, and shivering the _____________.

a.

stimulus, response

b.

response, stimulus

c.

receptor, response

d.

stimulus, receptor

Please select the best answer from the choices provided

Hair forms in the hair follicle.

Please select the best answer from the choices provided

An important characteristic of animals is that all of their cells works the same way, they do not have any specialization.

Please select the best answer from the choices provided

Maintaining a stable internal environment is called ___.

a.

heterostasis

c.

biological control

b.

homeostasis

d.

none of the above

Please select the best answer from the choices provided

Please select the word from the list that best fits the definition

Joining of an egg cell with a sperm cell in fertilization to create a zygote

sexual reproductionmale reproductive systemfemale reproductive systemmenstrual cycle

If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is

a.

100 beetles per square meter.

b.

20 beetles per square meter.

c.

5 beetles per square meter.

d.

4 beetles per square meter.

Please select the best answer from the choices provided

A contractile vacuole is a structure that collects extra water and expels it from a protist.

Please select the best answer from the choices provided

Fertilization usually takes place in the ovaries.

Please select the best answer from the choices provided

Intercellular fluid becomes known as lymph when ______.

a.

it exits the capillaries of the circulatory system

c.

begins to collect microorganisms

b.

enters the capillaries of the lymphatic system

d.

contains lymphocytes

Please select the best answer from the choices provided

Please select the word from the list that best fits the definition

Uses glands to release hormones that control body activities

endocrine systemendocrine glandsnegative feedback

How many layers of smooth muscle help with churning food in the stomach?

a.

one

b.

two

c.

three

d.

four

Please select the best answer from the choices provided

Two characteristics of most plants are a root system and a shoot system. Most of the structures in these systems are common to all plants; however, there are some variations. Which structure can sometimes be found as part of the shoot system?

stems
leaves
roots
flowers

Mutualism, commensalism, and parasitism are the three types of

a.

symbiotic relationships.

b.

predation.

c.

competition.

d.

prey adaptations.

Please select the best answer from the choices provided

Which of the following is NOT a function of blood?

a.

fight infections

c.

carry nutrients to cells

b.

carry oxygen to the body

d.

all of the above are functions of blood

Please select the best answer from the choices provided

All of these are first-line defenses EXCEPT ____.

a.

saliva

c.

antibodies

b.

cilia

d.

enzymes

Please select the best answer from the choices provided

 
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