The alternating contractions of the _____ and _____ ______ move the worm
Fill in the blank(s) with the appropriate word(s).
Answer: Circular and longitudinal
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A cuticle
a. resists water loss. b. covers epidermal cells. c. is a waxy substance. d. resists attack by microorganisms. e. has all of these characteristics.
Concerning the sex chromosomes, which of
the following is correct? a. The Y chromosome carries a greater number of genes for nonsexual traits than does the X. b. X and Y are different in size but carry nearly equal numbers of genes. c. The X chromosome carries more genes for nonsexual traits than does the Y. d. The X chromosome carries only genderrelated genes. e. The X chromosome carries the SRY gene
In most terrestrial and many aquatic ecosystems, the ________ food chain is the dominant pathway of energy flow
A) detrital B) grazing C) consumer D) heterotroph
Which of the following lipids is the primary component in cell membranes?
A) glycerol B) triglycerides C) steroids D) phospholipids