The heart, liver, and stomach are each examples of

a. a nerve.

b. a tissue.

c. an organ.

d. an organ system.

Which type of white matter fiber tract connects the cerebrum to lower centers

How does the carbon dioxide necessary for photosynthesis enter plants? a. through their roots b. through openings in the leaves called stomata c. the plants produce their own complete supply d. none of the above

What is the study of an organism's body structures and their locations called?

In an ecosystem, marsh snails feed on phytoplankton and painted turtles feed on marsh snails. Pollution has resulted in the depletion of phytoplankton.

Explain where the energy to cook food comes from when a gas stove burns natural gas, CH4, and oxygen, O2.

What do directional selection and disruptive selection have in common?

How does biotechnology can increase or decrease variation

Why is there very little methane in Earth's atmosphere compared to the amount of carbon dioxide

Which process makes it possible for the major organs of the body to be formed by week 10 of human development

How are gases distinguishable from a solid or liquid at the molecular level?