In lakes and ponds, phytoplankton and zooplankton are most abundant in the
A) benthic zone.
B) littoral zone.
C) limnetic zone.
D) profundal zone.
C
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Which one of the following statements does not accurately describe segregation of the sex chromosomes?
A. In human males, segregation of the X chromosome from the Y chromosome occurs during anaphase I of meiosis. B. In humans, half of the fertilized eggs are expected to be male and half are expected to be female; this 1:1 ratio is characteristic of Mendelian segregation. C. The secondary sex ratio of males to females at birth usually shows a slight excess of males. D. In humans, the sex at each birth is not a random process because there are often large families with either all girls or all boys. E. Females are slightly less likely to survive from conception to birth, but males are slightly less likely to survive from birth to reproductive maturity.
The transformation frequency of very competent cells is about 10-6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
Despite tensions between Taiwan and China, Taiwan is one of the world's biggest investors in China
Indicate whether this statement is true or false.
The prevention of genetic exchange between two species because they reproduce at different times of
the day or year is called:a. hybrid sterility. b. genetic isolation. c. sexual isolation. d. mechanical isolation. e. temporal isolation