What parts of the cardiovascular system are involved in the pumping and circulating of blood?

artery

vein

heart

alveoli

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants. d. selecting individuals at random.

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

Which feature would you expect to find in a population in which sexual selection depends on male competition?