Which Ecdysozoan phylum contains the 65 species of velvet worms?
a. Arthropoda
b. Nematoda
c. Onychophora
d. Nemertea
Ans: c. Onychophora
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The two main biological activities in the Ca and Si cycles are the biosynthesis of shells and exoskeletal material as well as the mineralization of these materials in sediments
Indicate whether the statement is true or false.
Xanthophyll is a pigment found in plants that helps protect the photosynthetic protein D 1 from:
A. water reactions B. chlorophyll C. damage by high temperatures D. damage by excess light energy E. membranes
In many organisms, ____________________ functions to transfer genetic information from the nucleus to the cytoplasm
Fill in the blank(s) with correct word
The ____ horizon is usually light in color and contains little organic matter
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon