What do your muscles need during exercise that blood brings? what waste product (produced during aerobic respiration) does the blood carry away?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

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.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.