Recently the focus of research in behavioral ecology has been on the contribution by behavior to an animal's reproductive success. What is this called?
A. longevity
B. average number of mates
C. fitness
D. rate of growth to sexual maturity
E. foraging efficiency
Answer: C
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Sharks live in seawater. Their tissues are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes. How is that possible?
A) Urea and trimethylamine oxide contribute to intra- and extracellular osmolarity in shark tissues. B) Metabolic intermediates of sharks tie up intracellular chloride and potassium ions. C) Their blood is hypotonic to their tissues. D) They excrete large quantities of electrolytes.
In vascular plants the ________ is larger than the __________
A. diploid sprorophyte; haploid gametophyte B. diploid gametophyte; haploid sporophyte C. haploid sporophyte; diploid gametophyte D. haploid gametophyte; diploid sporophyte
What is the term for chromosomes that do not reshuffle the alleles of linked genes?
What will be an ideal response?
The transfer of pollen from an anther to the stigma of a carpel is
A. fertilization. B. coevolution. C. germination. D. pollination.