What causes a layer of cells to form between a leaf and the stem, causing the leaves to fall

How does an "activated" receptor transfer information into the cell? a. by increased translation of the receptorb. by altering the ligand-binding site of the receptorc. through a conformational change of the receptord.

What would be a negative impact on the enviroment from a large-scale mining effort in the ocean

Any kind of agricultural activity that involves effective and efficient use of labor on small plots of land to maximize crop yield. True or False

A group of scientists have completed several investigations to gather evidence from fossils about the brachiopod. Which of these is the most likely outcome of the investigations?

The key factor that determines whether the undifferentiated gonads develop into testes is the A. secretion of testosterone from the adrenals. B. secretion of androgens from the gonads. C. gene Sry located on the X chromosome. D.

Charles darwin, after observing variability among plant and animal species in various locations, proposed an explanation for what he saw.

Sediments in and below a dewatered area of an aquifer become compacted because:

What is the largest available source of fresh water for drinking in the hydrosphere? A. Groundwater B. Oceans C. Rivers D. Glaciers

What is an abiotic factor that can be found in a rain forest ecosystem

Explain Why, in winter, most of the meltwater produced by salting the roads will not infiltrate the soil