2.2
Name three groups of heterotrophs and explain the difference among them.
(3)

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

As a small change in a person's dna can cause a genetic disorder

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots