Which structure is correctly paired with its tissue system?
A) root hair â€" vascular tissue
B) guard cell â€" vascular tissue
C) companion cell â€" ground tissue
D) tracheid â€" vascular tissue
Answer: D
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The structures that connect neighboring cardiac muscle cells to ensure rapid electrical conduction are
a. desmosomes. b. intercalated discs. c. synapses. d. endothelial cells. e. smooth muscle cells.
The bacteria that normally live on the mucous membranes of the digestive tract and vagina provide protection against infection with harmful disease-producing microorganisms
Indicate whether the statement is true or false
What evidence is there that choanoflagellates were the ancestors to animals? What will be an ideal response?
The most prevalent antibody class in the blood is
A) IgD. B) IgM. C) IgA. D) IgG. E) IgE.