Chemicals containing nitrogen are called i in blank
while chemicals containing
phosphorous are calledfill in blank
These
chemicals help plants grow
SES

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.