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MrRissso [65]
3 years ago
8

How old do scientists believe was the earliest cell on earth?

Biology
1 answer:
Kipish [7]3 years ago
8 0

Answer:

about 3.7 billion years

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.

Explanation:

hope it will help you

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If the vegetation was removed from the land the amount of of runoff would increase or decrease
NNADVOKAT [17]

Increase

Explanation:

Vegetation reduces surface runoff hence reducing soil erosion in several ways. The roots of plants bind together tightly the particles of the soil so it is not easy for erosion agents to carry the soi. The organic matter produced by this vegetation provides organic matter in which the soil particles bind tightly into humus that has larger particles that are not easily carried by elements of erosion. The vegetation also breaks winds and surface runoffs hence reducing their energy and their capacity to carry soil particles. Therefore, without vegetation, soil is exposed and vulnerable to agents of erosion.

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7 0
4 years ago
Throughout the world countries are dumping their garbage in the oceans. This dumping has affected the fish and other aquatic org
Anuta_ua [19.1K]

The correct answer is: D. tragedy of the commons theory.

The tragedy of the commons theory explains situation in a system where resources are shared  and suddenly the individual users start to act independently. Individual users (in this case world countries) start to act according to their own self-interest behave contrary to the common good of all other users (e.g. fishing companies) by depleting or spoiling that resource (fishes and other marine organisms) through their collective action.

7 0
4 years ago
Read 2 more answers
A lab protocol asks you to place 1 gram of tissue into 9 ml of PBS and then homogenize the mixture. You are then asked to take 1
castortr0y [4]

Answer:

100 micrograms per mL.

Explanation:

The PBS diluted mixture used for the standard curve measurement of protein concentration is a 1:10 dilution from the original homogenate of the protein with PBS. So, if the diluted mixture contains 10 micrograms per mL, the original homogenate contains 10x that. 10*10= 100 micrograms per mL.

3 0
3 years ago
Which statement best distinguishes plant and animal as they relate to amino acids?
alukav5142 [94]

Ans.

There are twenty amino acids that take part in protein synthesis. These amino acids act as precursor for all protein molecules and are known as essential amino acids. Plants can synthesize all twenty amino acids from simple precursors, while animals can make only twelve amino acids. Animals obtain remaining eight amino acids by eating plants.

Thus, the correct answer is 'option) D.'


4 0
4 years ago
Read 2 more answers
Where can you find a biodiversity hot spot? A. Finland B. New York C. New Zealand D. Texas
alukav5142 [94]
I'm thinking New Zealand. This is my own opinion so please correct me if I'm wrong. I don't think it would be New York or Texas and I don't know about Finland. I'm going with C. New Zealand.
8 0
3 years ago
Read 2 more answers
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