In chemical reactions, chemical reaction activation energy.

a. speed up; lowering
b. raise the temperature of; increasing
c. store atp in; lowering
d. slow down, pausing

Explain why phospholipid molecules form a bilayer. (3 marks)

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

The assembly called for a "bill of rights" that would list u.s. citizens'