Icefish have which type of circulatory system?
A. closed with a two-chambered heart
B. opened without a heart
C. closed with a single-chambered heart
D. closed with a three-chambered heart
E. closed with a four-chambered heart
A. closed with a two-chambered heart
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The membrane's permeability to sodium ions is at its maximum at label _____
A) A B) B C) C D) D E) E
The position of a cell within an embryo during embryonic development determines
a. which genes will be knocked out. b. the gender of the embryo. c. whether the cell will differentiate. d. which master genes are turned on. e. whether maternal mRNAs will be translated.
A short segment of DNA that contains the code or blueprint for one or more proteins is called a gene
Indicate whether the statement is true or false
Which one of the following marine ecosystems would be expected to have the lowest species diversity and primary production per unit area?
A. Oligotrophic oceans B. Intertidal zone C. Upwelling regions of ocean D. Coral reefs E. Estuaries