After the skin is cut and a capillary wall breaks, what's the first step in working to form a clot?
a. a set of reactions are triggered. b. thrombin causes sticky fibrin filaments to form the clot. c. the clot seals the area to prevent further blood loss. d. platelets clump at the site.

Depending on the organism the number of in a cell may change

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.