Why is it necessary for sex cells
to be haploid?
a. sex cells are not haploid.
b. to create a diploid organism
c. to create two haploid organisms

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Name the part of the the brain labeled "e".

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?