What would be the growth rate (r) of an island population of 1000 that has 30 births per 100
population, 20 death per 100 population, 5 immigrants per 100 population, and 10 emigrants per 100
population?
a. +5
b. ?50
c. +50
d. ?150
e. +150
C
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Explain horizontal gene transfer and demonstrate how this phenomenon has complicated evolutionary studies using a diagram that illustrates phylogenetic relationships between organisms and genes
What will be an ideal response?
Why might an individual with an STI need to be checked for other STIs, even though he/she has no symptoms of any others?
A. Several STI-causing pathogens are known to 'piggy back' on each other, being carried into the genital tract together. B. A diagnosis of an STI implies that the individual engaged in unprotected sexual intercourse. Several STIs are largely asymptomatic, so it is wise to test for a variety of typical STIs when the patient admits to or shows signs of engaging in such risky behavior. C. They don't need to be tested-all STIs are highly obviously symptomatic, so there is no need to test for other diseases than the one currently manifesting itself in the patient. D. It's a public health issue-it's best to know who is positive for what in the population of sexually-active individuals. This lets healthcare professionals act to best safeguard the population as a whole from the range of STIs.
Molluscs with a tubular shell and sheath foot are:
a. scaphopods. b. gastropods. c. bivalves. d. cephalopods. e. nudibranchs.
Leaves falling on the ground initially become a part
of soil horizon __________, but will later be a component of soil horizon __________. a. A; B b. A; O c. O; A d. B; A e. B; C