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Llana [10]
2 years ago
4

From about 4 billion years ago to about 2.5 billion years ago, oxygen gas became more common in Earth's atmosphere. Oxygen was a

toxic compound to most life forms from that time period. Today, oxygen is required by all but some of the most primitive life forms. Which statement best explains how early life forms that were harmed by oxygen evolved into today's life forms that require it?
Warming temperatures allowed the colonization of land environments, where oxygen was more plentiful.


Carbon dioxide-using species all became extinct, which allowed oxygen-using life forms to flourish in shallow oceans.


Over time, many species gradually adapted to a more oxygen-rich environment, allowing them to survive in shallow water and on land.


The growth of seas allowed early species to survive by using dissolved carbon dioxide in seawater rather than using it directly from the air.
Biology
1 answer:
miss Akunina [59]2 years ago
5 0

Answer:

it was until co2 came around and made it safe =to breath

Explanation:

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Sugar beets (Beta vulgaris) are a major crop in the Red River Valley of the North. Why do you think the beets have to be harvest
makvit [3.9K]
<h2>Sugar beet harvest </h2>

Explanation:

Sugar beets have to be harvested and stockpiled in September because  they have to get the root out of the ground before the ground freezes

  • Sugar beets are harvested with two primary pieces of equipment
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3 0
2 years ago
A benefit of monoculture farming practices is what?
katen-ka-za [31]

The main benefits of the monoculture farming are that it has higher production, is more efficient, and has lower costs. All three advantages of the monoculture farming are making it much more attractive for the farmers as it is more profitable and easier for work.

In this type of farming there's no spaces of the arable land that are lost because it is all planted with the same culture, and there isn't any other cultures with which there should be made empty spaces in between.

The costs for farming are lower, and also the work is easier and more efficient because the machinery can be used in the same manner constantly and the work can go on systematically on the farmlands.

On the other hand, we have to mention that there are also negative effects of this type of farming like the total destruction of animal and plant biodiversity in the area where it is practiced, as well as making the entire crop vulnerable to diseases and environmental changes.

4 0
2 years ago
Pros and cons of canopy fogging
pishuonlain [190]

Pros:

It is (mostly) based on pyrethrine spray which kills the insects rapidly.

It not poisonous to other animals.

It uses synthetic, natural spray which is safe to use because it breaks down within 10 minutes.

Te technique can reach tall forests.

It can be used in closed spaces ( greenhouses, basements etc).

 

Cons:

It requires windless circumstances ( which is mostly at nights).

Breathing fog may cause respiratory and throat irritation to some.

 

5 0
2 years ago
The rate of O2 production by the light reactions varies with the intensity of light because light is required as the energy sour
kupik [55]

Answer:

The correct answer is option a.

Explanation:

Yes, the light reactions also depend upon the Calvin cycle. Calvin cycle refers to a phenomenon that is used by the plants and algae to convert carbon dioxide from the atmosphere into sugar, the food needed by the autotrophs in order to grow. The plants rely upon the Calvin cycle for food and energy.  

In the given case, the rate of oxygen production would get diminish as the rate of ATP and NADP+ generated by the Calvin cycle diminishes. Of all the outcomes of the Calvin cycle, ADP and NADP+ are the only ones that get utilized by light reactions.  

The ADP and NADP+ are used up by the light reactions to fuel their reactions. This illustrates that if the rate of ADP and NADP+ generated by the Calvin cycle diminishes the production of oxygen by the light reactions also diminishes.  

5 0
2 years ago
A stream of water holds thriving bacteria. If drought conditions caused the stream to dry up, how would the bacteria mostly like
Alexeev081 [22]

The answer is they produce endospores.

Explanation:

The endospores are dormant, non-reproductive, tough bacterial spores that ensure the survival of bacteria in adverse conditions.

During the environmental stress, such as starvation, desiccation, radiation and chemical treatment many bacteria form dormant endospores. These endospores germinate again when the conditions become favorable.

Hence, if drought conditions lead the stream to dry up, the bacteria that live there would produce endospores to survive.

4 0
2 years ago
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