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topjm [15]
3 years ago
7

When do scientists believe life originated on Earth?

Biology
1 answer:
skad [1K]3 years ago
6 0
A. 3.7 billion years ago
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Relate sexual reproduction to evolutionary forces
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Sexual production is a means of recreating more of a species. Once there is a gene change whether for the good or bad, and solely if the organism survives to reproduce its gene, then it will be passed on to its children and going further on until there is a large amount of a species with that specific gene. This species evolved. Evolution occurs because of gene changes.
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3 years ago
The observation an author makes about life in his story is its _____.
DENIUS [597]
The observation an author makes about life in his story is its theme. 

A theme is like the moral in the story, it states the lesson/point of the story. The conflict is the problem in the story, and the plot is the sequence of order.

Answer: Theme
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3 years ago
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Ten points help me out it's due in an hour
hoa [83]

1A):  Fats are  =====>     <u>Solid at Room temperature</u>

1B):   Oils  are    =====>  Liquid at Room Temperature


2A):  Lipids ====> <u>Are a group of organic compounds, that include fats, oils, waxes and related substances. Lipids are composed of carbon and hydrogen, and oxygen, but there is no definite ratio of hydrogen to oxygen atoms lipids as there is in  carbohydrates. Simple lipids, which are the most  common type, are made up of three fatty acids molecules, and glycerol molecule.</u>


2B):  Carbohydrates  =====> <u>Are organic compounds composed of carbon, and hydrogen, and oxygen. The proportion of hydrogen atoms to oxygen atoms in carbohydrates is the same as in water; Two hydrogens to one oxygen. There are three basic types of carbohydrates. Monosaccharides, disaccharides, and polysaccharides.</u>


3): <u>A positive control ===> s</u><u>hould give the desired outcome of the experiment, provided that all the reagents and equipment are functioning properly. For example, if your experiment results in the ability of bacteria to grow on a petri plate containing antibiotic, your positive control will be bacteria that are known to carry the appropriate drug resistance marker. Even if none of your experimental bacteria grow, as long as there is growth of the positive control you know that growth was possible.  </u>

3B):   A Positive Control  =====> <u>should be designed to not give the desired outcome of the experiment. In the example above, bacteria which do not carry a drug resistance marker should not be able to grow on a petri plate containing antibiotic. If growth is observed, it is a red flag that something is wrong with the experiment.</u>




Hope that helps!!!                                  : )






6 0
3 years ago
A runner produced hypotonic sweat while running a marathon in hot weather. Aner the race, he drank large volumes of water. As a
choli [55]

Answer:

Option B) Swell

Explanation:

When runner was running he was sweating which results in loss of water from cells and cells become shrink. But at the end of marathon when he drink water his cells will gain water and store it, which results in swallowing of cells.

4 0
3 years ago
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Which of the following describes an antibiotic that is good for a human to take as a medicine?
natita [175]

Answer:

I would say that the answer is A. So Sorry if I'm wrong, but I'm 99% sure.

Explanation:

3 0
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