Which ACTN3 genotype (RR, RX, or XX) would provide these Olympic marathon athletes with an advantage, and why?

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

a. by using fur or clothes to trap heat energy near the body

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

when it is at an intermediate population density