Most aquatic invertebrates that have a circulatory system use internal or external ____

a. tracheal tubes
b. spiracles
c. lungs
d. gills
e. body walls for direct diffusion


d

Biology & Microbiology

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Which of the following statements are true about resting membrane potential? Select all correct choices

A. It results from the sodium-potassium pump moving more Na+ ions out of the cell compared to the number of K+ ions moved into the cell. B. It results from K+ ions moving out of the cell through passive diffusion. C. It results from voltage-gated sodium channels remaining open for long periods of time.

Biology & Microbiology

Due to their pinnately compound leaves, tropical habitat, and overall appearance members of which phylum are often thought of as a type of palm? 

A. Coniferophyta B. Gentophyta C. Cycadophyta D. Ginkophyta

Biology & Microbiology

The unique double shells of diatoms are made of 

A. cellulose. B. silica. C. chlorophylls. D. agar. E. proteins.

Biology & Microbiology

The human embryo's first blood cells arise in the

A) developing liver. B) developing bone marrow. C) yolk sac. D) allantois.

Biology & Microbiology