If a male human had a non-functioning sympathetic system, which of the following would happen?
a) sperm and semen could not be emitted into the urethra
b) vasodilation of the penis could not occur
c) an erection could not occur
d) both a and c
e) both b and c
Answer: a) sperm and semen could not be emitted into the urethra
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As you study two closely related predatory insect species, the two-spot and the three-spot avenger beetles, you notice that each species seeks prey at dawn in areas without the other species
However, where their ranges overlap, the two-spot avenger beetle hunts at night and the three-spot hunts in the morning. When you bring them into the laboratory and isolate the two different species, you discover that the offspring of both species are found to be nocturnal. You have discovered an example of _____. A) mutualism B) character displacement C) Batesian mimicry D) facultative commensalism E) resource partitioning
Genes in other species are useful for finding genes in the human genome. Indicate whether the statement is true or false
In meiosis, chromosomes containing sister chromatids (not homologous chromosomes) align along the center of the cell during
a)prophase I. b)prophase II. c)interphase II. d)metaphase I. e)metaphase II.
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.When you compare Australian marsupials to placental mammals today
A. living marsupials are little changed from the earliest marsupial fossil forms. B. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches. C. the marsupials are all very primitive, having changed very little during the last 70 million years. D. the marsupial fossils look remarkably similar to the placental mammals of today. E. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.