The function of platelets is all of the following except: A. they help form blood clots

B. they help a blood vessel repair itself •

C. they carry oxygen to injured areas of tissue

D. they secrete vasoconstrictors which promote vascular spasms

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

When plants use sunlight to make food, the energy of sunlight is