During the Pleistocene epoch, plant communities changed dynamically in response to:
a. a meteor impact.
b. intense grazing pressure.
c. competition with gymnosperms.
d. iridium in the soil.
e. fluctuating climates (ice ages).
E
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In graph (b) in the figure above, which of the following best explains the data given about Lotus corniculatus?
A) This plant grows best when AMF taxa A or C are present. B) Lotus corniculatus does not form mycorrhizal associations. C) Mycorrhizal fungi parasitize the plant's roots when they are present, reducing its growth. D) This plant forms multiple AMF associations, growing best with increased fungal diversity.
About 80% of all living gymnosperm species belong to the phylum ____
a. Anthophyta b. Cycadophyta c. Ginkgophyta d. Gnetophyta e. Coniferophyta
The accumulation of dead keratinocytes and the protein ____ on the skin surface forms a waterproof barrier
a. collagen b. elastin c. keratin d. albumin e. myosin
When a cell stops dividing by mitosis, at which stage of the cell cycle does it stop?
A. G1 D. Mitosis B. S E. Cytokinesis C. G2