Fishes with no teeth, jaws, or vertebrae are in the category of?
A) sharks
B) jawless
C) bony
D) cartiligiinous
Ans: B) jawless
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Which of the following information can be
discerned from tree rings?
a. age of the tree b. fire history c. climate history d. former parasite infestations e. all of this information can be discerned from tree rings
Most of the oxygen in the blood is transported by
a. plasma. b. serum. c. platelets. d. hemoglobin. e. leukocytes.
In an operon, the switch that controls mRNA synthesis is the promotor, which is a sequence of bases upstream from
the first structural gene. __________________ Indicate whether the statement is true or false.
Which of the following statements best justifies the use of the experimental results in an investigation of interspecies competition?
(A) When two populations use different sources of energy, one of the populations will thrivein a shared environment and the other will become extinct. (B) When two populations use the same sources of energy, resource availability in a shared environment limits the growth of both populations. (C) Because the change in entropy of a system containing two different species is always positive, populations typically grow fasterin shared environments. (D) Because the free energy of a system containing two different species is always negative, populations that utilize similar resources cannot coexist in nature.