What type of blood vessel returns blood to the heart?

A. Artery

B. Vein

C. Capillary

D. None of the above

Burning of fossil fuels has changed the atmosphere by A) producing a hole in the ozone. B) reducing the CFCs in the atmosphere. C) increasing the concentration of carbon dioxide. D) increasing the concentration of ozone in the atmosphere

Anna put some 2-inch apple slices in a food dehydrator, and she checked on them the next morning. Though they were the same shape as the night before, the apple slices now measured only an inch each. What happened to the apples? A.

How do humans get phosphorus from the environment? A) precipitation B) evaporation C) mining D) agriculture

What is the name of the process in which a sperm cell from a male organism joins an egg cell from a female organism? A. cellular migration B. fertilization C. replication D. cellular organization

Why are formulas used to describe substances

In what part of the cell does glycolysis take place

Geological evidence indicates that two landmasses, separated by a deep ocean channel, have been moving apart since 45 million years ago. You are studying a group of organisms that has widespread populations on both of the landmasses.

These are organisms produced with externally introduced genes

Which of the following statements about the field of health psychology is most accurate? a. It does not define health as being the mere absence of disease. b. It focuses exclusively on positive psychology. c.

Science Which factor is the main difference between a cell nucleus and a nucleiod? A. size of the organelle B. arrangement of the cytoskeleton C. movement of the flagella D. presence or absence of a surrounding membrane