Some kinds of shrimp obtain food by cleaning parasites from the surface of fish. This can be termed mutualism because
A. neither participating member is damaged.
B. both members benefit from the relationship.
C. the shrimp benefit and their hosts are not injured.
D. the host fishes cannot survive without the shrimp.
B. both members benefit from the relationship.
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Of the following structures, which one is not a specialized cell of the epidermis?
A. guard cells B. trichomes C. sclereids D. root hairs E. oil glands
Polar molecules are composed of covalently bonded
A. atoms of different electronegativity. B. ions. C. atoms of identical electronegativity. D. identical atoms. E. carbon atoms.
There are two types of retinoblastoma, familial and sporadic. In the familial form, a defective gene is generally inherited from one parent
Indicate whether the statement is true or false
Which stage would show the development of the ectoderm and endoderm germ layers?
A. early gastrulation B. blastulation C. neurulation D. late gastrulation