What causes the different seasons on Earth?
O
A. The angles at which the suns rays strike the Earth
B. The speed at which the Earth rotates on its axis
C. Increasing levels of carbon dioxide in the atmosphere.
) D. The distance between Earth and the sun
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small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.