Evidence shows that the earliest life may have existed how long ago?

a. 2 billion years ago
b. 3.5 billion years ago
c. 1.3 billion years ago


d. 630 million years ago
e. 250 million years ago


b

Biology & Microbiology

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Which of the following ciliates produces the disease ick in fish?

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Which gland is the remnant of the "third eye"?

a. pineal b. pituitary c. thyroid d. parathyroid e. thymus

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pH 8 and above solution is.

a. acidic b. basic c. neutral

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In water, MgCl2 dissociates into Mg2+ and Cl- . Based on this information what type of bond is involved in the formation of MgCl2?

A. hydrogen B. ionic C. polar covalent D. nonpolar covalent E. electrostatic

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