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erik [133]
3 years ago
13

1. Why do we experience different seasons on earth?

Biology
2 answers:
Dominik [7]3 years ago
6 0

Answer:

The tilt of the Earth's AXIS is the most important reason why seasons occur. We have hot summers and cold winters because of the tilt of the Earth's axis. The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later.

Explanation:

Usimov [2.4K]3 years ago
4 0

Answer:

<h3>Constant movement around the sun</h3>

Explanation:

We have different seasons because of the earth’s constant movement around the sun. The closer a place on earth is to the sun, the warmer it will be. The farther away it is, the colder it will be.

<h3>Brainiest?</h3>

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How does extracellular glucose inhibit transcription of the lac operon?
Genrish500 [490]

The extracellular glucose inhibit transcription of the lac operon (D) by reducing the levels of intracellular cAMP.

Lac operon is the assembly of various genes that are involved in the uptake and metabolism of lactose of E. coli or any other bacteria. It consists of a regulator gene, promoter gene, operator and structural gene. Structural genes are three: z, y and a. Each codes for a different enzyme.

cAMP is the cyclic Adenosine Monophosphate. It is produced by the bacteria when there are low levels of glucose in it. Hence it is also named as hunger signals. Therefore, cAMP is responsible for activating the operon to produce lactose.

To know more about cAMP, here

brainly.com/question/13794408

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3 0
2 years ago
Which of these processes does not require the cell to use energy A cell division b protein synthesis c DNA replication D diffusi
weeeeeb [17]

Answer:

D diffusion across a membrane

Explanation:

Based on whether or not energy input is required, there are two types of processes viz: passive and active. Passive processes are those that do not require energy input in form of ATP while active processes require energy input to occur.

An example of passive process is DIFFUSION, which is the movement of molecules from a region of high concentration to a region of low concentration across a membrane. Diffusion is passive i.e does not require energy, because movement occurs down a concentration gradient.

Other processes in the options like cell division, DNA replication and protein synthesis all require energy input to occur.

6 0
3 years ago
How long does it take for a hypothesis to become a theory
Charra [1.4K]

Answer:

Null hypothesis have a tendancy of never raise to that status. Yet, if a hypothesis is tested and prooven to aply having an universal vocation of being aplyed thrn it could become a Postulate

4 0
3 years ago
The pulmonary semilunar valve guards the entrance to the
cestrela7 [59]

Answer:

<h2>pulmonary trunk</h2>

Explanation:

The pulmonary valve is an important semilunar valve and found in the heart between the pulmonary artery and the right ventricle. This valve contains three cups that are responsible for the guarding of the pulmonary trunk. The pulmonary trunk is an important vessel of the heart that arises from the right ventricle and plays an important role in the circulation of the deoxygenated blood. The pulmonary trunk is called the main pulmonary artery.

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Which of the following is a contributing reason behind emerging disease? 
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The overuse of antibiotics. is a contributing reason behind emerging disease?
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