The Sun contributes to photosynthesis by providing plants with- a) oxygen atoms
b) chemical energy
c) radiant energy
d) gravitational force

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes

The diagram shows a chicken embryo and a human embryo