Molecular clocks
a. take advantage of the fact that all mutations affect the fitness of an organism.
b. take advantage of the fact that all mutations happen at a steady rate.
c. take advantage of the fact that only neutral mutations do not happen at a steady rate.
d. take advantage of known mutation rates to estimate how long ago organisms shared a common ancestor.

Analogy- 1 is to arete as 5 is to cirque horn glacial valley hanging valley

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.