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sesenic [268]
2 years ago
15

The secondary atmosphere of the earth was composed mainly of carbon dioxide and nitrogen volcanic gases nitrogen and oxygen carb

on dioxide and oxygen flag this question question 2 1 pts before the evolution of life produced the process of photosynthesis, small amounts of oxygen were added to the earth's atmosphere by the process of
Biology
1 answer:
o-na [289]2 years ago
6 0
A) The secondary atmosphere of the earth was composed mainly of volcanic gasses. Volcanic eruptions are caused by the dissolved gasses found in the magma. These volcanis eruptions release volcanic gasses in the atmosphere. The most abundant gas is water vapor which is very harmless. The other gases include carbon dioxide, hydrogen sulfide and sulfur dioxide.

B) Before evolution small amounts of oxygen were added to the atmosphere by the process of photodissociation of water vapor. Photodissociation of water vapor is the process through which water vapor molecules are broken down to form new molecules which are oxygen and hydrogen molecules. This process helped to increase the level of oxygen.
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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
Can others, besides athletes, benefit from skill-related fitness? why?
prisoha [69]
<span>Yes, people besides athletes can benefit from skill-related fitness. Skill related fitness training can increase the coordination, reaction time, balance and agility of individuals at large, leading to an increased in ability to complete routine workplace tasks. Accident avoidance can be a benefit to cab drivers with increased reaction times. Wait staff can benefit from increased balance to skillfully carry large trays, Mechanics with good coordination are able to more quickly assemble complex components and in the even of a physical confrontation police officers can benefit from increased agility.</span>
7 0
2 years ago
When a bacterial cell is present in an environment where both lactose and glucose are present, the glucose will be metabolized f
Umnica [9.8K]

Answer:

Option (A).

Explanation:

Lac operon system in bacteria explains the lactose metabolism in the cell. The first operon system was discovered by Jacob and Monod. Operon may be defined as the cluster of genes that are transcribed as a single RNA unit.

The bacteria uses glucose if glucose and lactose are present in the media. The bacterial cell can recognize the glucose presence as CAP-cAMP complex are required for the process of transcription and the complex level is low in the presence of glucose. This way bacteria turns off transcription for lactose genes even when the lactose is present.

Thus, the correct answer is option (A).

4 0
2 years ago
you and two friends enter a contest to count the number of jelly beans in a jar. your guess are 371, 271, and 500. the actual nu
SIZIF [17.4K]

Answer:

Neither precise nor accurate.

The values are not close to 700 (not accurate) nor are they close to each other ( not precise)

6 0
2 years ago
Compared with fraternal twins, identical twins are ________ similar in physical appearance. Compared with unrelated look-alike p
zvonat [6]

Answer;

-No more; no more

Compared with fraternal twins, identical twins are no more similar in physical appearance. Compared with unrelated look-alike pairs of individuals, identical twins report no more similar personalities.

Explanation;

-Compared with fraternal twins, identical twins are much more similar in extraversion, neuroticism and temperament.

-Since fraternal twins are 2 separate fertilized eggs, they usually develop two separate amniotic sacs, placentas, and supporting structures. Identical, or monozygotic, twins may or may not share the same amniotic sac, depending on how early the single fertilized egg divides into two.

5 0
2 years ago
Read 2 more answers
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