The picture represents the respiratory system which structure is represented by the x? the pharynx the lar

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

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees