In order for natural selection to occur which conditions are necessary?

A. No mutations

B. each organism born must survive

C. no variation

D. more born than can survive

What is the physical basis of the phototropic response?

Tidal energy is generated from the A : gravity of the sun and moon B: natural movement of tides C:areas that have only low tide D : costal passageways

Passive expiration is preceded by the: a. recoil of the lungs b. contraction of the internal intercostals muscles. c. contraction of the diaphragm. d. increase in atmospheric pressure. e. increase in CO2 in the blood

Why is the Cell Theory not a law?

Why is blood pressure used as a measure of cardiovascular health?

Which epithelial tissue type is most often found lining large ducts, such as those of the salivary glands or pancreas?

Evolution led to certain fishes, such as lung fishes to adapt to terrestrial mode of life. These fishes were the ancestors of modern amphibians. Which evolutionary mechanism is represented by this example?

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato.

What's the difference between transgression and marine regression

In DNA adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.