<span>Mass extinctions when at least half of all species die out. The largest mass extinction event occurred around 250 million years ago, when perhaps 95 % of all species went extinct. Now new ones appeared.
It was during Cretaceous.
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Photon</span>
Answer:
True
Explanation:
According to the Bureau of Meteorology (BOM), 80% of the land receives less than 600 mm (24 in) of rainfall annually and 50% has even less than 300 mm (12 in). As a whole, Australia has a very low annual average rainfall of 419 mm (16 in).
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I believe the correct answer is A. Irtysh
Answer:
A. 2:5
B. 4:13
C. 4:7
D. 50:11
Explanation:
To find a ratio in it’s simplest form, multiply the the fraction/decimal until you get a whole number and make sure that the ratio can’t be evenly reduced by dividing one number by the other.
Also, you marked this question as Geography instead of Math
It is especially important to monitor tides for people who rely on the sea for living - fishermen have to know the kinds of tides they are going to experience so as to decide whether to set off in search of fish or not. It is also quite important to monitor tides if there is some construction going on near the shore - for example, building bridges or docks, as when the tide comes, it may flood the whole thing. Scientists also study the tidal movements so as to better understand the circulation of the oceans.
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