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USPshnik [31]
3 years ago
8

1. Which layer is the oldest? How do you

Biology
2 answers:
icang [17]3 years ago
5 0
What are the options?
matrenka [14]3 years ago
4 0
Can you add the options please?
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the unicellular spores of the fern ceretopteris richardii are about 100 um in diameter.calculate the surface-area-to-volume rati
WINSTONCH [101]
The surface area will be:
S.A. = 6l²
S.A = 6(100 x 10⁻⁶)²

Volume = l³
Volume = (100 x 10⁻⁶)³

Surface area to volume ratio:
[6(100 x 10⁻⁶)²] / (100 x 10⁻⁶)³
S.A : Vol = 6 x 10⁴
4 0
3 years ago
Which is the most diverse group of seedless vascular plants?
Soloha48 [4]

Answer:

The most diverse group of seedless vascular plants are <u>the ferns .</u>

Explanation:

Ferns -

Ferns are the most advance seedless vascular plants and is the most diverse group . Ferns have branching roots and large leaves . But the whisk ferns , have lack of roots and leaves due to evolutionary reduction . In the process of evolutionary reduction , the natural selection reduces the size of the structure which no longer favors the particular environment . Hence , Photosynthesis in whisk ferns takes place in their green stem .

3 0
3 years ago
The United States’ fossil fuel shortage of makes the country dependent on outside sources.
Rainbow [258]
The answer is oil.

The United States' fossil shortage of oil makes the country dependent on outside sources. Mineral oil such as crude oil or commonly known as petroleum came from the ancient fossilized organic materials. This resource is limited. The US is now facing a shortage in oil and becoming dependent to some countries such as middle-east countries.
8 0
4 years ago
a light weight material is being tested effectiveness in blocking ultraviolet rays from the sun that cause skin to burn and poss
Lynna [10]
Exposing it to <span>ultraviolet rays and seeing the efectiveness</span>
3 0
3 years ago
Read 2 more answers
Please help me please
Karolina [17]

Answer:

They are metaloids

Explanation:

:))))))))

4 0
3 years ago
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