The echiuran Urechis is also known as:
a. the peanut worm.
b. the lugworm.
c. the innkeeper worm.
d. the beardworm.
e. the fan worm.
C
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Secondary metabolites are produced to
A. deter herbivores. B. deter competitors. C. aid in reproduction. D. aid in growth. E. deter competitors and aid in reproduction.
The form of natural selection that leads to an increase in the frequency of alleles which promote the fitness of genetic relatives is called ________
A) direct selection B) indirect selection C) inclusive selection D) kin selection
Which of the following is NOT true of sclerenchyma tissue?
A) It is made up of cells with thickened cell walls. B) It is a storage site for sugars and starches. C) It is associated with xylem and phloem in the vascular tissue system. D) It dies at maturity. E) It provides support to strengthen the plant.
Helicobacter pylori causes
A. duodenal ulcers. B. gastritis. C. stomach ulcers. D. increased risk for stomach cancer. E. All of the choices are correct.