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
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Maintenance of the uterine lining during pregnancy in mammals requires
A. estradiol. B. testosterone. C. FSH. D. LH. E. progesterone.
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.
Which of the following gases was absent from the atmosphere of the early Earth?
a. carbon dioxide b. oxygen c. nitrogen d. water vapor
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.