Which of the following consists of the solid water on earth's surface?
a. the geosphere
b. the cryosphere
c. the atmosphere
d. the biosphere

Lucia is walking barefoot in her yard. she accidentally steps on a nail. how will her nervous system work to generate a reaction? arrange the eventschronologically.

What should be the strand of complementary dna produced by the strand of dna shown below cgt ata

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.