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VARVARA [1.3K]
4 years ago
14

When did the first frog appear on Earth?

Biology
2 answers:
GarryVolchara [31]4 years ago
6 0
The first known ancestors of frogs were about 250,000,000 years ago
8_murik_8 [283]4 years ago
4 0

Answer:

The correct answer will be around 250 million years ago.

Explanation:

Frogs are the cold-blooded animals which lives in both water and land. So, they belong to the class amphibia.

The first amphibians appeared during Devonian period around 370 million years ago when life moved on land from water but the evolution of frogs is a debated topic.

Fossil evidences have shown that they evolved around 250 million years ago during the early Triassic period from Triadobatrachus, or triple frog. The earliest known true frog was tiny <em>Vieraella</em> species found in the South America.

Thus, frogs appeared for the first time around 250 million years ago.

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If the dna double helix in salmon contains 22% guanine, what is the percent of cytosine, thymine and adenine? express your answe
Oksanka [162]

Theoretically it is the Chargaff's rule which entails that the ratio of purines and pyrimidines are 1. So following that rule you can solve this question.

G (purine) = C (pyrimidine) and

A (purine) = T (pyrimidine)

So G + C  would be 28% and hence

A +C would be 72% i.e. 36% each.

Please note that their are certain modified bases besides these four are also there including methyl Cytosine, Methylated Adenine. But htese modification does not violate the Chargaff's rule and they follow standard Watson Crick base pairing.

3 0
3 years ago
You are hiking in the mountains and the trail goes around the side of the mountain. The trail slopes outwards such that your fee
kow [346]

Answer:

The movement of feet in the position to walk on trail which is tilted is called eversion and inversion movement.

Explanation:

Eversion and inversion movement:

In eversion movement, foot sole rotates away from the midline of body or median plane (turn outwards) while in inversion movement, sole of foot rotates towards the midline of body or median plane (turn inwards).

5 0
3 years ago
What is the purpose of medical ethics?
soldi70 [24.7K]
The answer is is third option
5 0
3 years ago
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How does cytokinesis occur in a animal cells
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MakcuM [25]

Answer:

Vitamins would have to be the best answer

Explanation:

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