What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
d
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If populations within the same area split into species, the process is known as
A. sympatric speciation. B. allopatric speciation. C. racial speciation. D. ecotypical speciation. E. reproductive speciation.
Which of the following did plants develop to deter predation by herbivores on land?
a. Metabolizing carbon dioxide b. Developing more rigid cell walls c. The emergence of thorns, spines, and toxic chemicals d. Alternation of generations between haploid and diploid
Fresh water is much more dilute than the cells of a fish, so the animal constantly takes in water at its gills. How would a freshwater fish osmoregulate?
A. drink seawater and use active transport at the gills to take up salt from the water B. drink seawater and use active transport at the gills to get rid of excess salts C. produce dilute urine and use active transport at the gills to take up salt from the water D. produce dilute urine and use active transport at the gills to get rid of excess salt from the water E. drink saltwater and produce dilute urine to rid itself of excess salt
A hypothesis can best be described as a(n):
a. data point b. conclusion c. observation d. tentative explanation e. stepwise problem-solving approach