Small cells function more effectively, because as cells become larger their surface area to volume ratio:
A. decreases.
B. is cubed.
C. increases.
D. stays the same.
E. is squared.
A. decreases.
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Your botany teacher is making assignments for a research project on a plant species. She assigns you to study hemlock (Conium maculatum) and mentions that is an r-selected species. Based on this, what characteristics would you predict to be true of hemlock? Check all that apply.
_____ HABITAT: Disturbed areas like the edges of agricultural fields. _____ HABITAT: Pristine, undisturbed meadows. _____ REPRODUCTION: Large numbers of seeds produced at a time. _____ REPRODUCTION: Small numbers of large seeds produced. _____ LIFESPAN: One to two years. _____ LIFESPAN: Several decades.
. When allopatric populations reestablish contact upon elimination of a geographical barrier, ____ has occurred
a. species clustering b. secondary contact c. parapatric speciation d. sympatric speciation e. evolutionary convergence
Which of the following is essential for development of discrete, isolated colonies?
A. assay medium B. differential medium C. solid medium D. broth medium E. selective medium
As a naturalist, you are responsible for training volunteers in the identification of the types of amphibians. The volunteers will use this information to correctly describe the animals to school groups that will visit your nature center. The training documentation for the volunteers lists important characteristics of the different groups of amphibian, but you notice that one of the items on the list is incorrect. Indicate which description is not correct.
A. Frogs and toads have external fertilization whereas salamanders and caecilians have internal fertilization. B. Frogs, toads, and most salamanders have four legs whereas caecilians are legless. C. Adult frogs, toads, and salamanders are predators of insects and other small animals whereas caecilians are herbivores. D. Frogs and toads lay eggs whereas some caecilians lay eggs and others give birth to live young. E. Salamanders and caecilians have external tails whereas frogs and toads do not.