If an organism is dorsoventrally flat, found in the marine environment and with vibrant colors, it is probably a Phylum Platyhelimenthes.
A-true
B-False
Answer is true.
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Answer the following statements true (T) or false (F)
1. All infectious diseases are caused by pathogens. 2. Pathogens greatly outnumber nonpathogens. 3. Using microorganisms to clean up the environment is known as bioremediation. 4. Microorganisms are essential in the field of genetic engineering. 5. Microorganisms probably appeared on earth about 3.5 million years ago.
In the female reproductive cycle, the endometrium is thickest ____
a. during the menstrual phase b. during the proliferative phase
c. shortly before ovulation d. during ovulation e. during the secretory phase
Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity?
A) Songbirds expend a tremendous amount of energy defending territories so that they spend less time feeding their young and fledgling mortality increases. B) Only the fittest males defend territories and they attract the fittest females so the best genes are conveyed to the next generation. C) Songbird males defend territories commensurate with the size from which they can derive adequate resources for themselves, their mate, and their chicks. D) Many individuals are killed in the ritualistic conflicts that go along with territorial defense. E) Songbirds make improvements to the territories they inhabit so that they can all enjoy larger clutches and successfully fledged chicks.
Sixty years of data from the Framingham Heart Study showed that people with low cholesterol had 50% more offspring, on average, than those with high cholesterol. Since it is known that cholesterol level is highly heritable, what can be concluded from this specific observation?
A. High cholesterol reduces an individual's fertility. B. The frequency of people with low cholesterol should increase in the U.S. population. C. Cholesterol level has a major effect on survival. D. Natural selection is largely nullified as an important evolutionary mechanism in modern human populations. E. Ethnic groups that traditionally have more children have a greater frequency of genes for low cholesterol.