Choose the correct option and justify:
Meiosis:
a- occurs in somatic cells.
b- maintains the chromosome number of a species throughout the generations.
c- conserves the number of chromosomes between the stem cell and daughter cells.
d- separation of sister chromatids.

Which contributions did galileo make to the model of the solar system? check all that apply.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

One of the purposes of transcription is to produce a sequence of bases that