Name the organelle of plant cells in which photosynthesis occurs

How do you date a sample of rock that you suspect as being one of the earliest on earth

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.