The function of the notochord is taken over by the ________ in vertebrates.
A. spinal cord
B. backbone
C. brain
D. ribs
Answer: B
Biology & Microbiology
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Which of the following are muscle cells that are active in vasoconstriction and vasodilation of blood vessels?
A. Skeletal muscle cells B. Cardiac muscle cells C. Endocardium D. Smooth muscle
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Use of cytokinins has had wide application in the horticultural industry because cytokinins are used in:
A. tissue cultures B. fruit production C. stem elongation D. flower maturation E. root development
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The excretory system used by adult mollusks consists of tubules called ____
a. nephrons b. hepatic tubules c. metanephridia d. Malpighian tubules e. protonephridia
Biology & Microbiology
Describe the five levels of ecological organization in the context of the biosphere and biomes
What will be an ideal response?
Biology & Microbiology