Among flowering plants, 30% to 80% of existing species are polyploidy somewhere within their evolutionary history

A. true
B. false


A

Biology & Microbiology

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Why don't hormones build up in the body over time? 

A. They are secreted from the body by exocrine glands. B. They are filtered out of the blood by lymph tissues. C. They do, but target tissues become desensitized over time. D. They are degraded by enzymes in the target tissue.

Biology & Microbiology

Simple diffusion occurs naturally as it of a system.

A. decreases the kinetic energy B. increases the entropy C. increases the potential energy D. decreases the equilibrium E. All of the answer choices are correct.

Biology & Microbiology

At high tide a coastal plant or animal cell will be in

Estuaries are locations where rivers flow into oceans, with tidal shifts changing the salt concentrations. Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. A. osmosis. B. an isotonic solution. C. a hypotonic solution. D. a hypertonic solution. E. equilibrium.

Biology & Microbiology

The letter "B" in the accompanying figure represents the ____

a. style b. ovary c. stigma d. anther e. filament

Biology & Microbiology