About ____ percent of children with Down syndrome are severely intellectually disabled
a. five
b. ten
c. twenty-five
d. thirty
e. forty
b
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Which of the following amino acids is/are negatively charged at physiological pH?
A. serine B. aspartate C. glutamate D. serine, aspartate, and glutamate E. aspartate and glutamate
Potassium-40 is useful in determining the age of a fossil in samples
A. 300,000 years of age and older. B. aged between 100,000 and 250,000 years. C. aged between 50,000 and 100,000 years. D. less than 50,000 years of age. E. less than 25,000 years of age.
Which of the following can reduce the level of genetic diversity?
1.gene flow 2.sexual selection 3.polyploidy speciation 4.genetic drift
You use your computer for several hours every day. Why is it important to have the proper hand rest and an adjustable workstation and to take frequent breaks from typing?
What will be an ideal response?