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3 years ago

How do plants and animals get nitrogen if not from the atmosphere?

Biology

1 answer:

GenaCL600 [577]3 years ago

8 0

Answer:

Our atmosphere (air) is comprised of 78% of nitrogen. However, this nitrogen is in its elementary state (N₂) and therefore is quite inactive, so the plants can not use it directly. Changing the elementary nitrogen into more reactive forms (NH₃, NO₂, HNO₃) is occurring through the process called nitrogen fixation. It is happening via two processes.

First one is physical nitrogen fixation. When some type of atmospheric physical energy (lightning bolt, for example) reacts with N₂, it splits it in two very reactive N atoms, enabling them to react with oxygen in order to form NO₂.

Second process is biological nitrogen fixation. It's done by bacteria, special bacteria living in the soil, able to use elementary nitrogen for its metabolical pathways resulting in production of ammonia, which can be used by plants. It's noteworthy that bacteria are responsible for about 90% of all nitrogen fixation.

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Secretion of cholecystokinin from the intestinal wall is stimulated by

Anna11 [10]

Answer:

The correct answer is: fat in the small intestine.

Explanation:

Cholecystokinin, abbreviated to CCK, is a hormone produced in the small intestine that participates in digestion. Its secretion is stimulated by fatty acids in the small intestine (more specifically, in the duodenum) and by the introduction of hydrochloric acid.

Cholecystokinin has the functions to 1) contract the gallbladder so it releases the stored bile into the intestine, and 2) stimulate the secretion of pancreatic juice, which induces satiety.

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3 years ago

Define Prokaryote is the simplest form and in your own words

bija089 [108]

Answer: unicellular organism with no nucleus

Explanation:

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4 years ago

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Your teacher has given you a sample of soil to examine. Would you use a dry mount or a wet mount to examine it? Explain your rea

shutvik [7]

Answer:

Dry mount

Explanation:

so you can examine the soil better and with a wet mount the soil gets all muddy and clumpy

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3 years ago

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Biology homework please help

ludmilkaskok [199]

Answer:

muscles

ribs

lungs

bronchioles

alveoli

diffuses

leaves

exchange

Explanation:

Your diaphragm, and muscles between your ribs, make air move in and out of your lungs. It travels through the trachea, bronchi, and bronchioles to alveoli. In the alveoli, oxygen diffuses into the blood and carbon dioxide leaves. This is gas exchange.

Air enters the lungs and leaves it as a result of the relaxation and contraction of the diaphragm and the muscles between the ribs. When both the muscles and the diaphragm relax, air enters from the trachea and travels through the bronchi and the bronchioles to the alveoli, where the oxygen in the air diffuses into the blood and carbon dioxide diffuse in the opposite direction. The entire process is known as gas exchange.

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3 years ago

Identify the suggested set of activities for the given

kotegsom [21]

The suggested set of activities for the corresponding principles regarding the Programs and teachers is explained below.

<h3>How to explain the information?</h3>

1. Programs and teachers engage families in ways that are truly reciprocal.

Programs and families can benefit from shared resources and information.
Teachers seek information about children’s lives, families, and communities.

2. Programs invite families to participate in program-level decisions and advocacy efforts.

Programs invite families to actively participate in making decisions about the program itself.
Programs also invite families to advocate for early childhood education in the wider community.

3. Programs invite families to participate in decision-making and goal-setting for their children.

Programs invite families to actively take part in making decisions concerning their children’s education.
Teachers and families jointly set goals for children’s education and learning both at home and at school.

4. Programs provide learning activities for the home and in the community.

Programs use learning activities at home and in the community to improve each child’s early learning.

5. Programs implement a comprehensive, program-level system of family engagement.

Programs institutionalize family engagement policies and practices and ensure that teachers, and other staff receive the supports they need to fully engage families

6. Teachers and programs engage families in two-way communication

Strategies allow for both school- and family-initiated communication that is timely and continuous.

Conversations focus on a child’s educational experience as well as the larger program.

Learn more about teachers on:

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2 years ago