What causes the reproductive isolation that can lead to speciation?
A) Members of one group don't want to mate with other groups.
B) Members of one group are unable to make fertile offspring with other groups.
C) A group is extinct.
D) Some members of a group are sterile.
B
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The increase in life expectancy in the United States in the last 100 years is mainly due to healthier lifestyles slowing the process of ageing
Indicate whether the statement is true or false
Atoms have no electric charge because they have ________.
A) uncharged neutrons in their nuclei B) an equal number of protons and neutrons C) an equal number of protons and electrons D) an equal number of charged and uncharged subatomic particles
Independent ______ occurs because each pair of homologous chromosomes separate independently of the others.
a. conjugation b. linkage c. assortment d. differentiation e. segregation
What is herd immunity?
A) the protection offered to you by the size of your country, as it limits potential outside contact with an infected individual B) at least 25 percent of the population needs to be immune before those too poor to receive the vaccination can be protected C) the only protection available to those who are unable to receive immunizations due to medical reasons D) small communities protect their children from being exposed to outside pathogens by limiting the contact their children have with outside visitors or workers E) the only protection available to those who choose not to receive immunizations due to religious belief