Along with death, this decreases population size

A) Skin cancer 

B) Carbon footprint 

C) Age structure 

D) Emigration 

E) Desertification

F) Chlorofluorocarbon 

G) Ozone 

H) Carrying capacity 

I) Density-dependent 

J) Death rate 


D) Emigration

Biology & Microbiology

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A keystone species has a greater effect on community structure than its numbers might suggest

Indicate whether the statement is true or false.

Biology & Microbiology

What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids? 

A. He would produce twice as many sperm and would be protected against infertility from other causes. B. He would produce twice as many sperm, which would crowd them during later development and lead to morphological defects. C. He would be entirely normal, since this is what usually happens. D. After one round of sperm production he would no longer be able to produce sperm and would be infertile.

Biology & Microbiology

Which of the following statements best describes the benefits of radiation therapy?

A. Radiation therapy can be combined with other therapies, including chemotherapy. B. Radiation therapy can be directed against specific cells and tissues within the body. C. Radiation damages the DNA within cancer cells, either slowing down cell division or stopping it altogether. D. Radiation therapy may shrink tumors, making them easier to remove surgically. E. All of the choices are correct.

Biology & Microbiology

If a single-stranded RNA virus contains genomic RNA that is identical to the mRNA that it produces, what type of virus is this categorized as? 

A. Positive strand B. Plus strand or positive strand is acceptable. C. Negative strand D. Plus strand E. Minus strand

Biology & Microbiology