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photoshop1234 [79]
4 years ago
11

50 points please help

Biology
1 answer:
TEA [102]4 years ago
4 0

Answer:

The CWA or clean water act in U.S.A has improved the water quality.

Explanation:

To regulate the pollutants discharge in water and to improve the quality of water bodies  U.S.A government has enforced the Clean Water Act. Earlier it was known as the Federal Water Pollution Control Act which was later expanded as CWA in 1972. Under this act many programmes are arranged for controlling the pollution by EPA.

According to the act, the discharge of pollutant in the moving water without any permission is illegal. The conveyances of discharge control include- pipes, houses connected to the municipality, using septic system etc. This act has greatly impacted pollution control and quality control of water bodies.

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In 1918, an influenza pandemic that originated with avian flu killed 50 million people. Researchers isolated samples of that vir
luda_lava [24]

Answer:

Personally, I believe the information helps.

Explanation:

Without this information the virus would not be contained, we would not have done research, taken samples, tested out the virus, or even attempted to contain it. With this information we can attempt to prevent a break out of the disease again. This is my personal opinion though.

6 0
3 years ago
In 3-5 sentences, describe the human respiratory system and its functions.
Liula [17]

Answer:

The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history. In land animals the respiratory surface is internalized as linings of the lungs. Gas exchange in the lungs occurs in millions of small air sacs called alveoli in mammals and reptiles, but atria in birds. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood. These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds. Air has to be pumped from the environment into the alveoli or atria by the process of breathing which involves the muscles of respiration.

Explanation:

5 0
3 years ago
What is the difference between a fat and an oil(they are both triglycerides)
olga_2 [115]
The major differences are that fats are solid at room temperature while oils are liquid, and that oils are usually of plant origin while fats are of animal origin.
5 0
3 years ago
When a free-moving object moves from the North Pole (90%) towards the equator (0°), it curves fro
svetoff [14.1K]

Answer:

(3)

Explanation:

I found it on a website.

3 0
3 years ago
Forces that uplift and wear down the Earth’s surface?
guapka [62]
I think that it's weathering because weathering is the one that wears down the surface.
4 0
4 years ago
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