What happened when the boy dropped the lighted match

What is the next step in muscle contraction after the actin changes shape? (apex)

If animal agriculture was eliminated, how much grain would become available for human consumption?

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of