Which greenhouse gas is released by bacteria engaged in anaerobic metabolism?
a. nitrous oxide
b. carbon dioxide
c. methane
d. ozone
c. methane
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A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest
A. amniocentesis. B. genetic counseling. C. chorionic villi sampling. D. a pedigree analysis.
Oak trees and many other plant species have years in which they have synchronous production of many progeny by all individuals in a population. This is known as
A. sympatry. B. crypsis. C. semelparity. D. masting.
Which of the following statements regarding cells is false?
A) All cells are enclosed in a membrane that maintains internal conditions different from the surroundings. B) All cells have a cell wall. C) All cells can interconvert forms of energy. D) All cells have DNA as their genetic material.
What structure is responsible for physically organizing the events of the cell?
What will be an ideal response?