Match the example to its term Cell
Tissue
Organ
Organ system

1. Brain
2. Brain, spinal
cord, and nerves
together
3. Nervous tissue
4. Neuron

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously

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