Ecological theory states that for every organism there is at LEAST one ________, and the microenvironment where the organism is most successful is called the ________.
A. prime niche/ niche
B. community/ population
C. niche/ prime niche
D. population/ community
Ans: C. niche/ prime niche
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Branches of a phylogenetic tree are organized by which principle?
a. morphology b. geographic proximity c. genetic relationships d. sapidity
How do insects overcome the inefficiency of their hemolymph flow in taking oxygen to their tissues?
A. Their bodies are tubular, thus increasing the body surface area where gaseous exchange takes place. B. Insects have highly vascularized extensions of their body walls, called parapodia. C. Their respiratory system consists of tracheae, which are tiny air tubes that take oxygen directly to the cells. D. A countercurrent mechanism ensures that the maximum amount of oxygen is absorbed from the environment.
What is the outcome of the process illustrated in the accompanying figure.?
a. One male and one female cell b. Four new but genetically distinct cells c. Two new but genetically distinct cells d. Two new genetically identical cells that differ genetically from what they were before e. Four new genetically identical cells that differ genetically from what they were before
Gradualism is rarely observed in the fossil record because:a
too may species are extinct. b. the fossil record is incomplete. c. not enough species have evolved. d. very few instances of speciation have been observed. e. more scientists believe in the model of punctuated equilibrium.