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irina1246 [14]
4 years ago
13

What important event in animal evolution marks the beginning of the Cambrian period?

Biology
1 answer:
Alenkinab [10]4 years ago
3 0

The appearance of fossils would the the answer.

Although there has been some scientific debate about what fossil strata should mark the beginning of this period, the "International Geological Congress" determined that the Cambrian period was approximately 543 million years ago of which the first appearance in the fossil record of worms that made horizontal burrows was discovered.

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Why do waves that travel through basalt have a higher velocity than a wave traveling through sand?
Veseljchak [2.6K]

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i think it's beccause basalt let's more waves in

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7 0
3 years ago
1. Which weather variable can be determined by using a psychrometer?
Maksim231197 [3]

Answer:

atmospheric humidity.

Explanation:

used to measure the amount of water vapor in air, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed.

3 0
3 years ago
The mitral valve is in between which two chambers of the heart?
d1i1m1o1n [39]
Lit is located between the left ventricle and left atrium.

Left atrium is known to be one of the four chambers of heart that receives oxygenated blood from the right and left pulmonary veins. This blood is pumps to the left ventricle through the mitral valve. However, left ventricle is responsible for pushing oxygenated blood through the aorta to the rest of the body.


3 0
3 years ago
An ecological effort by a nonprofit organization has targeted abandoned farms as a way to help local farmers earn more money. On
kotegsom [21]

Answer:

lll only is wrong even though this is not the correct answer hope it helps

Explanation:

8 0
3 years ago
An ecosystem has 150 organisms of 15 different species. What is the biodiversity index of this ecosystem?
iren2701 [21]

Answer:

0.1

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In this example, there are 15 species in an area and we divide that by 150 organisms to get a 0.1 biodiversity index.

4 0
3 years ago
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