The phylum Platyhelminthes are more commonly known as:
a. ribbon worms.
b. mollusks.
c. snails.
d. earthworms.
e. flatworms
Ans: e. flatworms
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Like the insects, the arachnids (spiders and so on) have
(a) three pairs of walking legs. (b) one pair of antennae. (c) true mandibles. (d) an abdomen.
Which structure causes the lens to bend or relax enabling an individual to focus on objects that are near or far?
a. Sclera b. Retina c. Ciliary muscles d. Cornea e. Pupil
Which of the following is a component of phloem?
A. Tracheids B. Sclerenchyma cells C. Epidermal cells D. Cork cambium E. Collenchyma cells
The taxonomic system is a way to
A) demonstrate the relationship between microbes and disease. B) classify organisms based on similarities. C) identify chemicals which may be toxic to microbes. D) demonstrate spontaneous generation. E) study disease in human populations