Alexandra is researching the effects plate tectonics have on the shape of earth. which of the following is a result of plate tectonics?

a) the movement of ocean currents

b) radiation from the sun

c)the gravity of the moon

d)heat within earth

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates