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
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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.
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
The unique double shells of diatoms are made of
A. cellulose. B. silica. C. chlorophylls. D. agar. E. proteins.
The human embryo's first blood cells arise in the
A) developing liver. B) developing bone marrow. C) yolk sac. D) allantois.