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ELEN [110]
3 years ago
12

HELP ME GUYS PLEASE!

Biology
2 answers:
german3 years ago
8 0

Answer: number 1

Explanation: that is when we could first sustain life because that is when we gained atmosphere and when we could hold carbon and oxogen

olga2289 [7]3 years ago
7 0

Answer:

I think the answer was A. Because before the ozone layer oxygen was not as much for life on earth to evolve so once the ozone layer started to form up it kept organisms and earth surface safe from direct uv lights so life started evolving.

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If a DNA molecule is found to be composed of 35% thymine, what percentage of cytosine would be expected, and why?
-Dominant- [34]
We use Chargaff's rule to get the answer. [A] + [G] = [C]+ [T].    [A] + [G] + [C] + [T] = 100% Where is A is Adenine, G is Gaunine, T is Thymine and C is Cytosine. In DNA, Adenine always pairs with Thymine, and Guanine always pairs with Cytosine. Therefore if Thymine is 35%, then Adenine will also be 35% to make 70% in total. The remaining percentage will be 100% - 70% = 30%. The 30% will be shared equally among Cytosine and Guanine, at 15% each. Therefore Cytosine will be 15% 
4 0
4 years ago
Air and water quality, climate, erosion, disease transmission, pest proliferation, and pollination are all examples of which cat
Gennadij [26K]

Answer:

Regulating

Explanation:

According to Millennium Ecosystem Assessment, there are four major categories of ecosystem services. These services include:

1. Provisioning

2. Regulating

3. Supporting

4. Cultural

The Regulating category is the category that consists of Air and water quality - Purification, climate, erosion, disease transmission, and pest proliferation - Biological control, and pollination.

The ecosystem services are services or functions rendered by the natural environment that ensure the environment is sustainable and healthy for human use.

8 0
3 years ago
Which animal responded to an internal cue?
frozen [14]
The correct answer would be “All of the Above”
3 0
3 years ago
Read 2 more answers
How are neurotransmitters and hormones similar and how are they different?
ratelena [41]

Answer:

Both neurotransmitters and hormones influence our thoughts and motivations, as well as our ability to learn and concentrate. However, neurotransmitters are short-lived while hormones act for longer periods of time.

5 0
3 years ago
Describe the microscopic structures you would expect to see in the lungs.
Sati [7]

Answer:

Alveoli

Explain:

They are the workhorses of your respiratory system. You have about 480 million alveoli, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli shrink to expel carbon dioxide.

5 0
3 years ago
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