Some cells such as human nerve cells and muscle cells contain many more mitochondria than do other cells, such as skin cells. Why do some cells have more mitochondria than others?

A) The cells use more energy
B) The cells divide frequently
C) The cells break down more proteins
D) The cells store more nutrients

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Which beat describes the brain stem

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.