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Kitty [74]
3 years ago
7

What evidence BEST supports the presence of atmospheric oxygen 2.7 billion years ago?

Biology
1 answer:
Serhud [2]3 years ago
7 0

Answer:c

Explanation:layered iron rust in rocks

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What kind of energy heats our school in winter?
LiRa [457]
Thermal energy/ heat energy
4 0
3 years ago
What is NOT true about the evidence that fossils provide?
aleksandrvk [35]

Answer:

C. All fossils contain intact DNA that can be sequenced.

Explanation:

Fossils are the impression, trace or preserved remains of once-living thing from past thousands of years such as bones, exoskeletons, objects preserved in amber, and stone imprints of animals or microbes.

Fossils provide evidence about seevral characteristics and features of extinct organism such as evolutionary relationship between organisms and  transitional forms between groups of organisms. but all the fossil do not provide evidence about the intact DNA that can be sequenced because some fossils carry DNA rumnants which do not have the ability to get sequenced.

Hence, the correct option is C.

6 0
3 years ago
Below is a food web from a tundra ecosystem in Nunavut, a territory in Northern Canada
navik [9.2K]

Answer:

2 and 4

Explanation:

Those eat things to become secondary

3 0
1 year ago
Restless tectonic plates move (shift) between one and fifteen centimeters per __________. year month day minute
Wittaler [7]

Hello There!

<u><em>Restless tectonic plates move (shift) between one and fifteen centimeters per "YEAR"</em></u>

<u><em></em></u>

<u><em>Tectonic plates move at a moderate around one and fifteen centimeters  per year. The plates move in different ways, once in a while crashing into one another.</em></u>

6 0
3 years ago
Read 2 more answers
Imagine that you are observing an enzyme-catalyzed reaction in the lab. Every time you add more enzyme, the reaction rate increa
Aleks04 [339]

Answer:

<u>All the substrates are bound to the enzyme</u>, thats why the reaction rate stopped increasing.

Explanation:

Actually an enzyme works by binding a substrate molecule to its active site, producing a product  , resulting in an increase in the rate of reaction.

            Enzyme + substrate = Enzyme + product

Whenever enzymes are added , reaction rate increases as the substrates are being bound to the enzyme's active sites but then occurs a stage where further addition of enzyme cannot increase the reaction rate because all the substrates have bound to the enzyme and <u>there are no substrates left.</u> Hence the reaction rate stopped increasing.

7 0
3 years ago
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