Autotrophs differ from heterotrophs because they a. utilize oxygen to burn food. b. do not require oxygen to live. c. make carbon dioxide as a product of using food. d. make their own food from carbon dioxide and water.

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing

Which measure of an earthquake depends on how close you are to the focus?