Primary infertility is diagnosed when a couple who has had one child has trouble conceiving a second
a. True
b. False
Indicate whether the statement is true or false
False
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A fruit is a mature ____ that contains seeds
a. egg b. ovule c. megaspore d. endosperm
e. ovaryA scientist is examining motile protist. He wishes to determine their direction of movement. Which of the following microscopic techniques is least likely to be used to view these cells?
A) light microscopy B) electron microscopy C) differential interference contrast microscopy D) fluorescence microscopy E) phase-contrast microscopy
A magnesium ion contains twelve protons and ten electrons. A chloride ion contains seventeen protons and eighteen electrons. Given this information, the chemical formula for magnesium chloride is
A. MgCl. B. Mg2Cl. C. MgCl2. D. Mg2Cl2.
Why do amphibians need to live in moist habitats?
What will be an ideal response?