Researchers find a group of crocodiles in which an expanded incubation temperature gives rise to male crocodiles. This particular group of crocodiles hatch male crocodiles even with incubation temperatures as low as 29 ?C. What type of scientific approach has led to this observation?
A. Discovery-based science.
B. Hypothesis testing.
A. Discovery-based science.
B. Hypothesis testing.
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Viruses that are polyhedrons with 20 sides are said to have ________ symmetry.
Fill in the blank(s) with the appropriate word(s).
What is a photosynthetic stem that stores water and is found in succulent plants in the desert?
a. bulbs b. tubers c. stolons d. cladodes e. corms
Mutations that convert proto-oncogenes to oncogenes are mutations that cause
A. the gene to produce an altered gene product. B. underproduction of a normal gene product. C. overproduction of a normal gene product. D. an increase in the number of copies of the normal gene. E. all of these.
One of the functions of skin is the synthesis of vitamin D. Which of the following would be evidence for this function?
A) Vitamin D levels are higher in people who take supplements, such as multivitamins. B) Vitamin D levels are lower in people who wear sunscreen. C) Cancer rates are higher in people with more sun exposure. D) People living in the tropics are vitamin D deficient.