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myrzilka [38]
3 years ago
6

Fossilized stromatolites

Biology
1 answer:
Cerrena [4.2K]3 years ago
6 0

Answer:

(B) resemble structures formed by bacterial communities that are found today in some shallow marine bays.

Explanation:

Extant stromatolites represent real "living fossils" for they are decendents of ancient forms that are associated with one of the first living forms on earth. Particularly, stromatolites are real bacteria communities where the autotrophic organism of the community are represented by cyanobacteria, which live along with heterotrophic bacteria. This clearly indicates that fossilized stromatolites points to bacteria (prokaryotes) as the first living things on earth (dated with not less than 3.5 billion year old)

Nowadays, stromatolites with cyanobacteria allows to reconstruct and understand fossilized forms. These current structures live in shallow marines ambients (e.g. Australia) but also in continental salt flats (e.g. Argentina) where few others bacteria can survive to these extreme conditions (high light exposure and salt concentration).

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Scientist are studying an 500g. Sample of a radioactive element. Which has an annual decay rate of 11%. How many grams of the sa
gtnhenbr [62]

Nothing

Explanation:

Mass of the sample = 500g

Decay rate per anum = 11%

Unknown:

Mass of sample remaining after 10yrs = ?

Solution:

  This is a simple percentages problem;

The radioactive sample loses \frac{11}{100 } x 500g of sample per year;

  this is a loss of 55g per year;

In 10years time, the sample would have lost 10 x 55g = 550g of element.

Since our sample is not up to 550g, then no amount of sample will remain after 10yrs.

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6 0
3 years ago
Hemoglobin is the protein that transports oxygen in mammals. Different species of mammals have slightly different forms of hemog
slavikrds [6]

Answer:

The correct answer is - 6.8950.61 gm per mole

Explanation:

Given:

One form of hemoglobin is 0.324% Fe by mass

1 hemoglobin = 4 Fe

Solution:

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100 % correspond to = 223.4 *100/0.324

= 68950.61 gm

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6 0
3 years ago
Fungi produce many compounds that humans are able to use medically. how can you account for these compounds?
levacccp [35]
None of those options are correct. 

Fungi produce,naturally, antibiotics that will kill or inhibit the growth of bacteria.
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The only thing scientists had to do is isolate that antibiotic.

Some antibiotics that were developed from fungi: penicillin and cephalosporins.
5 0
3 years ago
I need help I will mark brainliest <br><br><br> Can someone give me the step by step answer
OLga [1]

Answer

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Explanation:

<u>Given-</u>

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<u>To find -</u>

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<u>Solution-</u>

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Option third.

4 0
2 years ago
Which of the following accurately compares nearsightedness and farsightedness? (1.0 points)
Kisachek [45]

Answer:

C

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