The oldest fossils of anatomically modern ________ are 160,000 years old
Fill in the blank(s) with correct word
Homo sapiens
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A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte tissue red. If the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur?
A) The pollen grains will be pure red. B) The pollen grains will be pure blue. C) The pollen grains will have red interiors and blue exteriors. D) The pollen grains will have blue interiors and red exteriors. E) Insofar as the pollen grains are independent of the plant that produced them, they will not absorb either stain.
The membrane of a gas vesicle is composed of
A) various phospholipids. B) proteins. C) carbohydrates. D) both glycoproteins and phospholipids.
If you were given a new necklace and developed reddening, swelling, and itching of your skin around your neck 24 hours after putting on the necklace, what reason would you give to this phenomenon? What immune cells are involved?
What will be an ideal response?
Bacteria in biofilms
A) are composed of only a single species. B) are easily treated and removed. C) form on teeth, medical devices and in the middle ear. D) behave the same way as planktonic, or single-living bacteria.