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slega [8]
3 years ago
11

18. Approximately when did the first plants and arthropods appear on land?

Biology
2 answers:
quester [9]3 years ago
5 0

Answer:

C.

Explanation:

LenaWriter [7]3 years ago
3 0

Answer:

C. 444 Ma

Explanation:

The first plants that managed to colonize the land appeared around 470 million years ago, while the first arthropods on land appear i the fossil records around 450 million years ago, so we can say that around the period of 444 million years ago they were well established on land. The first arthropods that started to have terrestrial life were almost identical to those in water, with only minor changes that enabled them to breathe and move more easily. The first plants on land were non-vascular plants. They were small as they initially didn't had deep and well established roots.

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Which of the following animals look liike their parents at at birth? A;frogs B flies C turtles D
mamaluj [8]

Answer:

C

Explanation:

Turtles look like their parents at birth

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Why is nonpoint surface pollution is a greater threat and hazard than point source pollution
Natasha_Volkova [10]
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6 0
3 years ago
1. Discuss gravitational force in our universe and how it words. 2. Why is it critical to our universe? 3. Name at least three i
abruzzese [7]
<h2>Answer 1:</h2>

The gravitational force is a force that attracts any objects with mass. Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy including planets, stars, galaxies, and even light are brought toward one another.

Answer 2:

Gravity keeps things together. It is a force that attracts matter towards it. Anything with mass creates gravity, but the amount of gravity is proportional to the amount of mass.

Gravitational force is critical to our universe because with out gravitational force we cannot walk on earth, all the matter on earth cannot stay on it with out gravity. Everything will start floating in air with out gravity.

<h2>Answer 3:</h2>

Gravity is the powerful force that glues our universe together.

  1. One of the most noticeable effects of gravity in the solar system is the orbit of the planets.
  2. The planet keeps moving but is always caught up in the push-pull forces caused by the interaction of these gravitational forces. As a result, the planet begins orbiting the sun.
  3. The same phenomenon causes the moon to orbit around the Earth except its the Earth's gravitational force not the sun's that keeps it moving around us.
5 0
3 years ago
Unlike DNA, RNA
Lisa [10]
<span>The answer is D. pairs uracil with adenosine instead of thymine. Through the process of elimination, both DNA and RNA contain nitrogenous bases. However, DNA contains sugar deoxyribose within its nucleotide components while RNA contains sugar ribose. Also, DNA has 2 strands wrapped in a helix while RNA has only 1 strand. Thus, the correct choice is D. because RNA pairs uracil with adenosine instead of thymine like DNA.</span>
7 0
3 years ago
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