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Bad White [126]
2 years ago
15

1. Describe DDT and summarize the history of the use and banning of DDT, including actions taken by the U.S. government. State t

he major reasons for spraying with DDT and for banning it. State three or more ways science has played a role in the controversy.
Biology
2 answers:
igomit [66]2 years ago
4 0

DDT stands for  dichloro-diphenyl-trichloroethane. The first kind of synthetic/artificial insecticides came into use in the 1940s. The earlier usage of DDT include:  a) Killing of malarial vectors, b) Combatting Typhus and other insect borne human diseases, c) As a pest control in crops d) as a pest control in garden, live stock production and even at homes.  

The negative impact of DDT could be felt for the first time when the pests that were earlier killed by use of DDT have now become pesticides resistant. In the 1950s in USA, the regulatory measures were adopted to reduce the usage of DDTs as its effects as a pesticides were no more long significant and also it was creating detrimental physical and psychological impacts on the human and environment.

It was in 1972 that the U.S. Environmental Protection Agency cancelled the order for banning the usage of DDT based on the adverse impact it produced on the environment, human and other life forms. Since then continuous studies are being conducted to analyse the impact of DDTs. In some later years it was established that DDT is the cause of producing tumors in liver.  

Some of the common negative impacts produced by DDT as per the U.S. Department of Agriculture :  

a) The non destructive nature – DDT can not be destroyed and thus it remains persistent in the atmosphere

b) It attacks the tissues of living organisms especially the animals and humans  ( fatty tissue)

c) It can penetrate the atmosphere to deeper extent.

Now as per the current stuation, The use of DDT is controlled and other alternatives of pest control organisms is being deduced. As per the treaty of Stockholm Convention on POPs (Persistent organic pollutants) , usage of DDT for malarial control is justified but it puts a restrictive use of DDT as pesticides in other areas.  

Luda [366]2 years ago
4 0

Answer:

In my experience, the ways to optimize a laboratory are as follow:

1-Have optimized the space for the laboratory equipment

2-The Laminar Flow Hood need to be close to the outdoor

3-Need to have drawers under the lab counter

4-Need to have many labeled places to put minor equipment

5-It is necessary to train new researchers before they use the reactives and the lab equipment

Explanation:

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How does compartmentalization organize a cell's functions?
irakobra [83]
The answer is i<span>t allows for specialized functions in each of the compartments.

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5 0
2 years ago
In this example, we used lotka-volterra equations to model populations of rabbits and wolves. let's modify those equations as fo
Daniel [21]

Answer:

Wolves absence would lead the rabbit population to become stable at 5,000.

Explanation:

Step 1. Concept

If there is a missing variable that should be in the system, set that particular variable to zero and make the necessary conclusion.

Step 2. Given,

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

dW/dt = −0.02W + 0.00002RW

Step 3. Calculation

The transformed equations of populations of rabbit and wolves will be

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

dW/dt = −0.02W + 0.00002RW

Let's check the rabbit population in the absence of wolves(W) to 0

Thus,

Differential equation dR/dt

dR/dt = 0.08R(1 - 000.2R) - 0.001RW

Take W to equal to O

dR/dt = 0.08R(1 - 000.2R) - 0.001R(0)

dR/dt = 0.08R(1 - 000.2R)

When,

dR/dt = 0 we have R = 0 or R = 5,000

This,

R = 5,000 becomes the equilibrium point in the absence of wolves

Then,

0 < R < 5,000, dR/dt > 0

For R, let's estimate a value rise of the rabbit population to 5,000

Then,

R > 5,000, dR/dt < 0

Judging from the value if R, we infer a deduction in the rabbit population by 5,000

Thus,

We can conclude that wolves absence would lead the rabbit population to become stable at 5,000.

7 0
1 year ago
What type of protist is heterotrophic and includes species whose cells can come together to form a slug that moves to a new habi
Reil [10]

Answer: Fungus like protists are heterotrophic and feed on organic matter.

Cellular slime mould is a species of fungus like protists that form slug.

Explanation:

Fungus like protists are heterotrophic and the feed on organic matter and mostly unicellular.

Cellular slime mould are protists belonging to class Dictyostelia. They are heterotrophic and decomposers that live on organic matter. When there is deterioration condition, the cells migrates together to form slugs and move to form new habitat. Some of the cells form stalk and others form spores.

8 0
1 year ago
The ATP that is generated in glycolysis is produced by substrate-level phosphorylation, a very different mechanism than the one
Lostsunrise [7]

Answer:

TP synthesis in glycolysis: substrate-level phosphorylation

Explanation:

-One of the substrates is a molecule derived from the breakdown of glucose

-An enzyme is required in order for the reaction to occur

-A bond must be broken between an organic molecule and phosphate before ATP can form.

Incorrect:

-The phosphate group added to ADP to make ATP comes from free inorganic phosphate ions.

-The enyzmes involved in ATP synthesis must be attached to a membrane to produce ATP.

6 0
2 years ago
Why might a large predator and a small animal that it eats have different adaptations?
Sever21 [200]
brainly.com/question/5014160
4 0
2 years ago
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