Which model would predict the abrupt appearance of a new species in the fossil record, with little or
no evidence of intermediate forms?
a. anagenesis
b. gradualism
c. microevolution
d. paedomorphosis
e. punctuated equilibriu
E
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Answer the following statements true (T) or false (F)
1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. 2. The pace of evolution may change due to sudden environmental shifts such as climate change. This may result in rapid evolution. 3. 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 in which the animal never develops a terrestrial phase. This is an example of paedomorphosis. 4. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships. 5. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species.
Exocytosis is stimulated by regional increases in ________ concentration.
Fill in the blank(s) with the appropriate word(s).
A resting neuron
A. has a positive charge inside and negative charge outside. B. has a negative charge inside and a positive charge outside. C. is positively charged at the dendrites and negatively charged at the axon. D. is nonpolar.
An ecologist studying effects of bees on seed production by flowering plants is working at which level of ecological complexity?
What will be an ideal response?