A unifying principle of biology states that there is a gradual modification of populations of living things over time that sometimes results in new species. This principle is called ________
Fill in the blank(s) with correct word
evolution
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Chlorosis in plants is a condition best explained by:
A. lack of water. B. lack of certain minerals. C. lack of oxygen. D. lack of carbon dioxide. E. lack of soil moisture.
Which of these molecules may be found on both surfaces of the plasma membrane, but never spanning between them?
a. cholesterol b. integrin c. peripheral protein d. phospholipid
Why do we have fossils for only about 250,000 different species, although there must have been millions more species?
1.Fossils can form only if exposed to air, and most fossils are buried.
2.Fossils formed only where there were major disruptive geologic events, so they are relatively rare.
3.Fossils are found close to the surface so many have been destroyed by development.
4.Many ancient and extinct species were very soft, so did not fossilize well.
What are the two primary factors that can cause deciduous trees to drop their leaves? What will be an ideal response?