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WARRIOR [948]
3 years ago
10

What is thought to have caused the mass extinction at the end of the Cretaceous Period? A) global warming Eliminate B) an astero

id hitting Earth in Mexico C) extensive volcanic activity world-wide D) the start of glaciation and climatic changes
Biology
2 answers:
GalinKa [24]3 years ago
5 0

The answer is B. Geology has shown a thin layer of iridium (a rare mineral on earth but found on asteroids and meteors) in the rock layers between the Cretaceous and Paleogene periods. Below this layer are numerous fossils of  pterosaurs and dinosaurs, but above the layer are drastically few. The aftermath of asteroid impact is believed to have smothered most vegetation from earth which dinosaurs depended on as a source of food.  






kifflom [539]3 years ago
5 0

Answer:

B

Explanation:

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Answer:

C

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7 0
2 years ago
there are multiple chickens and rabbits in a cage there are 72 heads and 200 feet inside of the cage how many chickens are in th
schepotkina [342]
The answer is 44 chickens and 28 rabbits.

We have a system of two equations.
x - the number of rabbits
y - the number of chickens

Both chicken and rabbit have only 1 head, so the first equation is: x + y = 72.
Since rabbits have 4 legs and chickens 2 legs, the second equation is: 4x + 2y = 200.

Now, let's solve the system:
x + y = 72
4x + 2y = 200
___________
y = 72 - x
⇒ 4x + 2 · (72 - x) = 200
4x + 2 · 72 - 2 · x = 200
4x + 144 - 2x = 200
2x + 144 = 200
2x = 200 - 144
2x = 56
⇒ x = 56 ÷ 2 = 28
So, there are 28 rabbits.

Since
y = 72 - x = 72 - 28 = 44,
there are 44 chickens.

7 0
3 years ago
Forest rangers are genetically testing the deer in the forest after many were found dead. The tests determined that due to inbre
anyanavicka [17]

Answer:

they need to introduce new deer and won't the earth worms and other such primary consumers will thrive because the deer are not there to eat them

Explanation:

6 0
3 years ago
Read 2 more answers
Lập bảng so sánh adn và arn
Sergeeva-Olga [200]

Answer:

like DNA, RNA is made up of nucleotides.There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.

Explanation:

hope this helps :)

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Where is a place where two geologic units meet
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A place where 2 geologic units meet is called contact .
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