Barnacles are sessile filter feeders but unlike bivalves they have internal fertilization. How do they solve this problem?
A. The filter sperm from the water column.
B. They get fertilized during free living larval stages.
C. They are hermaphrodites with especially long penises.
D. They are only capable of asexual reproduction.
Answer: C
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Some cytoskeletal elements are more permanent than others. Which components of the cytoskeleton are dynamic structures?
A. microtubules B. microfilaments C. intermediate filaments D. both microtubules and intermediate filaments E. both microtubules and microfilaments
Measuring its costs and benefits in terms of energy spent and/or gained, which interaction involves one individual neither gaining nor losing? Select all that apply
A. competition B. predation C. obligate mutalism D. facultative mutalism E. commensalism
All of the following comprise the second line of defense except ________.
A. inflammation B. fever C. complement proteins D. antibody production E. phagocytosis
The fossil record is usually derived from sedimentary rocks laid down millions of years ago.
a. true b. false