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?
A. Nyctotherus B. Balantidium C. Ichthyophthirius D. Entodinium
Biology & Microbiology
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
Biology & Microbiology
Which gland is the remnant of the "third eye"?
a. pineal b. pituitary c. thyroid d. parathyroid e. thymus
Biology & Microbiology
pH 8 and above solution is.
a. acidic b. basic c. neutral
Biology & Microbiology