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WITCHER [35]
3 years ago
7

Fish first appeared: a) after the "Age of the Dinosaurs" during the Mesozoic Era. b) during the Ordovician Period of the Paleozo

ic Era. c) in the Cretaceous Period of the Mesozoic Era. d) when land plants evolved during the Carboniferous Period. e) when amphibians dominated the oceans.
Biology
2 answers:
Sveta_85 [38]3 years ago
6 0

Answer:

C. Fish first appeared when land plants evolved during the Carboniferous period

Explanation:

The age of fish was 410-360 million years ago which was called the Devonian period of the Paleozoic Era. This period immediately followed the Carboniferous Era which is 360-286 million years ago when amphibians dominate the land animals on the planet. Agnathans or jawless fishes are the first backboned fish. These fishes survived by sucking food in through the holes in their head.

Sergeu [11.5K]3 years ago
4 0

Answer:

during the Cambrian Period of the Paleozoic Era.

Explanation:

The Paleozoic is the earliest era (of three) of the Phanerozoic Eon and is composed of six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian (in that order from earliest to the latest). Fish first appeared about 530 million years ago during the Cambrian explosion.

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andrew-mc [135]

Answer:

Option (D)

Explanation:

In terms of chemistry, a catalyst is usually defined as the substance that is commonly used in a reaction in order to increase the rate of reaction, without getting consumed. It helps in the reduction of activation energy.

In the given case, the lever or a person can be considered as a catalyst because both of these will increase the efficiency (or rate) in removing the rock from the top of the perch. Thus, the lever or the human will remain the same after the removal of rock as a catalyst can be recovered after the reaction.

Therefore, the correct answer is option (D).

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3 years ago
What are the two types of dietary carbohydrates?
Rainbow [258]
<span>simple and complex

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5 0
3 years ago
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Luther burbank was a plant breeder who developed a strain of potato plant that produced more tubers (the part of the root that p
Radda [10]
<span>I belive the answer is D. Burbank's process did not involve environmental pressures to shape the outcome. 

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Zepler [3.9K]

Answer: <em>D. Causes an accumulation of lipids in brain cells</em>

Explanation:

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3 years ago
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