Which of the following is true about marsupial mammals?
a) They fill many niches in Australia that are occupied by placental mammals in other parts of the world.
b) They have gone extinct as a result of the greater fitness of placental mammals.
c) They are less fit than placental mammals.
d) They are more closely related to each other than they are to placental mammals.
e) Both a) and d) are correct.
Ans: e) Both a) and d) are correct.
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Answer the following statements true (T) or false (F)
1. In red-winged blackbirds, females tend to choose males with the most desirable territories and males compete with each other for territories. Redwing blackbirds demonstrate both intersexual selection and intrasexual selection. 2. Cryptic female choice is a type of intrasexual selection. 3. A population undergoing microevolution would show Hardy-Weinberg disequilibrium. 4. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle and is an example of paedomorphosis.
The structure(s) critical to the function of a chemical synapse include
_____ gap junctions. _____ neurotransmitters. _____ vesicles. _____ voltage-gated Ca2+ channels. _____ electrical signals.
DNA in the nucleus winds around proteins called
A) histones. B) karyosomes. C) ribosomes. D) proteasomes.
Why may it have been an evolutionary advantage for cephalopods to have a highly reduced shell or none at all?
What will be an ideal response?