T or F? The axial skeleton includes the upper and lower extremities.
What will be an ideal response?
False
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Which of the following statements about sexual selection is not correct?
A. Phenotypic differences exist between the sexes. B. Most often females invest more resources in the offspring than the male. C. Selection pressure drives the female to be more attractive. D. Reproductive success in a female is limited by the number of eggs or the number of pregnancies she can carry. E. Reproductive success in the male is determined by the number of his mates.
The hypothesis that species diversity is greater at lower latitudes than higher latitudes because low-latitude habitats are older would be supported if:
A. speciation rates were the same at high and low latitudes. B. speciation rates were higher at low latitude than at high latitude. C. speciation rates were higher at high latitude than at low latitude. D. speciation rates were more variable at high latitude than at low latitude. E. speciation rates were more variable at low latitude than at high latitude.
The enzyme that catalyzes the activation of tRNA molecules is:
A. the ribosome. B. RNA polymerase. C. tRNA isomerse. D. aminoacyl-tRNA synthetase.
About 200 years ago, Jan Baptista van Helmont wanted to know where growing plants get the materials necessary for increases in size. He planted a tree seedling weighing 5 pounds in a barrel filled with 200 pounds of soil and then watered the tree regularly. After five years, the tree weighed 169 pounds, 3 ounces, and the soil weighed 199 pounds, 14 ounces. Because the tree had gained so much
weight and the soil had lost so little, he concluded that the tree had gained all of its additional weight by absorbing the water he had added to the barrel, but of course he was incorrect. What really happened? What will be an ideal response?