Which of the following are late successional species?
A) trees
B) grass
C) weeds
D) forbs
A
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DNA and RNA are alike in that they
a. both have same pentose sugar. b. use the same nitrogenous bases to assemble the genetic code. c. have the same number of strands. d. both play vital roles in gene expression. e. are both made in the cytoplasm.
Why are the changes associated with development irreversible?
What will be an ideal response?
A zoo in Southern California has been successfully breeding arctic wolves and they want to exchange some of their extra wolves for kangaroos from a zoo in southwestern Australia. Since it is July, it is quite cold in the other zoo compared to Southern California. What discussion might the zookeepers have about transferring the wolves?
A. After growing up in Southern California, the individual wolves have lost their ability to adapt to cold temperatures, but their progeny will still get the cold-adapted genes. B. Although the wolves are genetically adapted to cold weather have not grown their cold weather coats. C. After several generations in Southern California, the wolves have lost their adaptive genes for cold temperatures. D. Since Arctic wolves are well-adapted to cold, this should pose no problems.
Edward Jenner was the physician who first used cowpox to vaccinate individuals against smallpox.
Answer the following statement true (T) or false (F)