Substances that start chemical reactions are called

a. substrata.
b. starters.
c. promoters.
d. reactants.
e. products.


D

Biology & Microbiology

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Andrew is studying bone development and calcium absorption in elephants. Which vitamin is

likely an important component of his study?

a. vitamin D b. vitamin A c. vitamin K d. vitamin B

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Which of the following pertains to diphtheria?

A. Prevented by the DTaP immunization B. Symptoms include vomiting and diarrhea C. Results in meningitis D. Can be transmitted from mother's birth canal to neonate

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Describe the symbiotic relationships of tube-dwelling and burrowing worms

What will be an ideal response?

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Vertebrate locomotion results from the contraction of muscles anchored to what other tissue?

A. bone B. an exoskeleton C. nerves D. the plasma membrane E. each other

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