When did the last mass extinction occur?
o
a. at the beginning of this era.
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b. at the beginning of this period.
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c. at the beginning of this epoch.
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d. at the beginning of this eon.

What molecules does hemoglobin decay into over time

About how much of the cell mass is watet

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes