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Romashka [77]
3 years ago
7

According to most scientific models, how many years ago did the first simple cells appear on Earth?

Biology
1 answer:
alexandr402 [8]3 years ago
7 0

About 3.6 billion years ago, one billion years after the formation of Earth, the first simple cells (prokaryotes) appeared on Earth. Hope this helps!

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BIOLOGY EXPERTS HELP!!! Which of the following examples poses the greatest potential threat to an ecosystem’s biodiversity?
ki77a [65]

Answer:

b) A nonnative species of bee is introduced to prey on the introduced species of fire ants in the Southern United States.

Explanation:

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3 years ago
Which of these statements is false? Veins always carry blood toward the heart. Veins can carry oxygen-rich blood. Arteries alway
Alex73 [517]

Answer:

Arteries never carry oxygen rich blood

Explanation:

This is totally wrong as most Arteries carry oxygenated blood away from.the heart to other organs and structures. Only the pulmonary artery carries deoxygenated blood to the lungs for oxygenation

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3 years ago
Which of the following is NOT a necessary characteristic of life?
jeka57 [31]

Answer:

I would say B?

Explanation:

5 0
3 years ago
Read 2 more answers
Match the appropriate food item with the indicator chemical you would use to detect the principal organic molecule present in th
Valentin [98]

Answer:

raspberry jam -  benedict's solution

honey -  benedict's solution

ground turkey - biuret reagent

oatmeal - iodine

Explanation:

Benedict's test is a test used to confirm simple carbohydrates. it helps in identifying reducing sugars that have free ketone or aldehyde functional groups. Raspberry jam has mainly carbohydrates that can be tested by this indicator.

An iodine test is for the determination of starch which is a non-reducing sugar such as oatmeal

Sudan IV (C24H20N4O) is used for the presence of staining of lipids, triglycerides and lipoproteins. There is no food item given that has a proper amount of fat or lipid

Beuret reagent is a protein testing reagent that shows the presence of the protein. Ground turkey has a huge amount of protein that can be indicated by this

4 0
3 years ago
Why is pyruvic acid never the end product of fermentation
Igoryamba

Answer:

Pyruvic acid is not the end product of fermentation because in fermentation the pyruvic acid is converted into alcohol/lactic acid and carbon dioxide. There are two types of fermentation alcoholic fermentation and lactic acid fermentation.

In alcoholic fermentation, pyruvate is converted into ethanol and CO2 for example in yeast and in lactic acid fermentation pyruvate is converted into lactic acid and CO2 for example in animals muscles.

Therefore in fermentation pyruvic acid is not the end product of fermentation. In fermentation 2 ATP is produced.  

6 0
3 years ago
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