How does a catalyst work? using these
a. by increasing the temp. of a chemical reaction
b. by decreasing the pressure of a chemical reaction
c. by increasing the concentration of reactants in a reaction
d. by decreasing the activation energy of a reaction

Which statement about the pancreas is not true? a. it is an endocrine organ in the abdomen. b. it release chemicals into the digestive system. c. it releases insulin to increase glucose levels. d. it release hormones into the bloodstream.

What problem would a person most likely have if her kidney did not work correctly?

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species