Two species that have experienced several thousand years of isolation from one another are now incapable of producing viable offspring despite mating efforts. What type of reproductive isolating mechanism developed between the two species?
What will be an ideal response?
postzygotic mechanisms
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What is on the snout of the turtle?
Fill in the blank(s) with the appropriate word(s).
In science, the word "theory" ____
a. is an explanation that has not been published b. has essentially the same meaning as a prediction c. is based mostly on opinions d. signifies that a hypothesis has been tested and proven over a period of time e. means that a scientist has a hunch something is true
Why can mature plants be cloned to produce genetically identical copies?
A) Mature plant cells contain only a fraction of the genes found in an adult plant. B) Plants have evolved over time to suit the need of human agriculture. C) Mature plant cells can develop into all the specialized cells of an adult plant. D) Scientists have engineered all plants to have this ability.
Which of the following is a true statement?
a) DO focus on the diagnosis and treatment of human diseases b) Vaccination is considered passive immunity c) Ebola's VP35, VP40 and VP24 block interferon production d) Interferon interrupts DNA replication directly e) Both A and C are true