Soil particles that are decomposing organic matter are called

a. sand.
b. humus.
c. silt.
d. clay.
e. mineral.


B

Biology & Microbiology

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Hover flies like to drop in at outdoor picnics to

sample the sweets, but the reaction of humans is to flee the scene because of the flies' uncanny resemblance to bees. Thus the survival of Hover flies is enhanced by

a. mimicry. b. display behavior. c. warning coloration. d. chemical defenses. e. camouflage

Biology & Microbiology

What is a characteristic of eukaryotes?

a. All are multicelled organisms b. Their cells are typically smaller than bacteria. c. They are more like bacteria than archaea. d. Their cells are less complex than bacteria or archaea. e. Their DNA is contained in a nucleus.

Biology & Microbiology

Many chromosome abnormalities (trisomies and monosomies) are not observed in the human population because

a. they are lethal and cause spontaneous abortion of the embryo early in development. b. all trisomies and monosomies are lethal early in childhood. c. meiosis distributes chromosomes to daughter cells with great precision. d. they are so difficult to count. e. the human meiotic spindle is self-correcting.

Biology & Microbiology

The portals of entry of a pathogen in the human body include all except

A .skin B. Respiratory tract C. urogenital system D .Gastrointestinal system E. All of the above

Biology & Microbiology