What happens when the diaphragm contracts? a. the volume of the thoracic cavity increases. b. the diaphragm rises. c. the volume of the thoracic cavity decreases. d. the rib cage moves down.

Describe the structure and functions of enzymes

Explain how the oraginsms would be affected if the snail population died out

Darwin was the only scientist to propose a theory of evolution a. True b. False

the condition is a genetic disorder that causes nerve degeneration with symptoms that most often appear in midlife

Read the article and then answer the questions. CPR What is CPR?

He wanted to observe cells in the fish's eye, but he saw nothing. Explain why.

Which technology has allowed for exploration beyond our solar system?

Which important property of DNA did Friedrich Miescher discover? -It is made partly of sugar molecules. -It has a double-helix structure. -It is three-dimensional. -It is found in the nucleus of a cell.

2. What is meant by predation? What is the relationship between a predator and a prey?

Sex-linked recessive disorders are most often passed from mother to sons