The double helix model for questions eight through 13 on lines provided label the parts of the DNA molecule that response to the number in the diagram 

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

What is the 77 element on the periodtic table

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.