The female plant structure on which a pollen grain must land for sexual reproduction to occur is the:a
style.
b. ovary.
c. stigma.
d. anther.
e. style.
c
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Which of the following could be found in or on the nasal epithelium of mammals?
A. a layer of mucus B. olfactory receptors C. basal cells that give rise to olfactory receptors D. supporting cells between olfactory receptor cells E. All of these choices are correct
Which of the following types of evidence supports the multiregional model for human evolution?
1.genetic markers on the Y chromosome 2.fossil evidence 3.mitochondrial DNA 4.microsatellite data 5.autosomal gene sequences
Guard cells control the opening and closing of plant stomata by creating osmotic gradients across their membranes, which are adjusted by regulating the concentration of ________ in their cytoplasm
Fill in the blank(s) with correct word
Disease-causing microorganisms are called
A) Eukaryotes B) Decomposers C) Pathogens D) Prokaryotes E) Fermenters