What is radiometric dating?
A) The process of determining the age of a fossil from radioactive isotopes
B) The mineralization process by which living things are turned into fossils
C) The process of determining the age of a fossil based on which layer in the rock it is found
D) The process of determining the age of a fossil using radio waves
A
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The uterine cycle is also called the ovarian cycle
Indicate whether the statement is true or false.
If cowbird eggs are included in an oropendola nest in the open woodlands of Central America, what
would be the expected outcome?
a. The cowbird eggs would be ejected from the nest to eliminate the competition. b. The cowbird eggs would be ejected from the nest due to a reaction of the mother bird's immune system. c. The cowbird eggs would not be ejected from the nest because they provide an additional food source. d. The cowbird eggs would not be ejected from the nest because they provide protection from large predators. e. The cowbird eggs would not be ejected from the nest because they provide protection from parasites.
Which of the following is true of purines?
A) Cytosine is a purine. B) Adenine's bonding to thymine is stronger than is guanine's to cytosine. C) Purines have a double-ringed structure. D) Both adenine and thymine are purines. E) Purines bind readily to deoxyribose but not to ribose.
Imagine two populations of snails that are polymorphic for sexual reproduction. In each of the two popula-tions, several asexual lineages and a panmictic, sexually reproducing subpopulation of snails are living in the same environment
Several years ago, a new pathogen was detected in the first population. This pathogen is predominantly transmitted between parents and their offspring, but on occasion it is also transmitted horizontally between unrelated individuals. The pathogen is now infecting both sexual and asexual individuals. Since the introduc-tion of the pathogen, the formerly stable ratio of sexual vs. asexual snails has shifted significantly in favor of the sexually reproducing individuals. The second population became at the same time infected with a patho-gen that is almost always transmitted horizontally. In the second population, no shift in the ratio of sexuals vs. asexuals has been observed. Speculate on why the difference in transmission between the two pathogens may have shifted the proportion of sexual reproduction in the first but not in the second population. Limit your answer to one to two sentences. What will be an ideal response?