The part of a cell that is in most direct contact with the environment is the (a) nucleus (b) cell membrane (c) mitochondrion (d) centrioles

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.

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Glands that the body deal with stress and respond to emergencies.