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Sveta_85 [38]
3 years ago
15

23. Economic systems_____

Biology
1 answer:
stealth61 [152]3 years ago
8 0

Answer:

Option A

Explanation:

Most of the human economic systems if not all operate with the human natural systems. Human economic system and natural systems almost dependent on one another in that they are linked by a network of interconnected  processes; for example, human economic activity depend on natural, including a maintained system of primary productivity such as forests and agriculture etc.

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List the five classes of antibody heavy chains and provide one function for each.
Lesechka [4]

Answer:

IgM, IgA, IgE, IgD and IgG

Explanation:

IgM functions in the initial response to offence.

IgA is important for protection of mucus membranes such as in saliva, sweat, tears and gastric fluid.

IgE is active during allergic reactions and defense against infections.

IgD is found on the surface of lymphocytes and is activated upon contact with antigens.

IgG forms part of the secondary response to antigen and is also responsible for newborn protection.

8 0
3 years ago
What did darwin believe was the primary cause of evolution?
lesya692 [45]

→ Darwin believed that the need to adapt, in similar words, the changes occruing in the environment caused evolution.

The main cause of evolution, according to Darwin, was natural selection. Natural selection is a process in which a group of organisms with certain characteristics survive and thrive, in comparison to other organisms with different characteristics. This idea basically means that having some characteristics makes you suited for an environment.


And how would that ↑ explain Evolution?

Well, evolution is the change in species that occurs during time. But for you to change, there must be a cause for that change, which is none other than the need to survive, reproduce, etc.


→ As mentioned before, not all characteristics are enough to surive, and hopefully the image pasted below will help you.



Hope it helped,


BioTeacher101

8 0
2 years ago
Which statement best describes why accreditation is important?
hjlf

Answer:

yyuuhhh. ¿¿¿¿¿

Explanation:

(my bad man)

5 0
3 years ago
3. Human skin cells divide at a higher rate than neurons (nerve cells). Hypothesize why this may be.
Katena32 [7]

Answer:

the skin cells prevent germs from coming in our bodies

Explanation:

8 0
3 years ago
In the natural blank method, the natural physical, chemical, and biological processes in soil and water gradually break down pol
allochka39001 [22]

Answer: Attenuation

Explanation: Natural attenuation: in this method, the natural physical, chemical, and biological processes in soil and water gradually break down contamination or pollutants into harmless components. It helps reduce contamination concentration and soil and water to acceptable levels. Examples of natural attenuation processes include

- dilution or dispersal of pollutants in moving water

- volatilization or reduction of pollutants into vapor

- absorption or attachment of balloons to soil or vegetation

These processes are accomplish naturally. Little or no human intervention is necessary.

8 0
3 years ago
Read 2 more answers
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