What are root nodules?

a. connecting points between branching roots
b. symbiotic associations between a fungus and plant roots
c. specialized root hairs
d. localized swellings in plant roots filled with nitrogen-fixing bacteria


Answer: d. localized swellings in plant roots filled with nitrogen-fixing bacteria

Biology & Microbiology

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Maintenance of the uterine lining during pregnancy in mammals requires

A. estradiol. B. testosterone. C. FSH. D. LH. E. progesterone.

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Triglycerides are used to coat skin, hair and feathers of animals to keep them protected, lubricated and pliable

Indicate whether the statement is true or false.

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Which of the following gases was absent from the atmosphere of the early Earth?

a. carbon dioxide b. oxygen c. nitrogen d. water vapor

Biology & Microbiology

Members of the class Bivalvia:A

have gills that secrete the shell. B. have a mantle that may form pearls. C. are all sessile. D. all have a radula. E. have a broad foot used for locomotion.

Biology & Microbiology