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Bad White [126]
3 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]3 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]3 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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The estimated density or number of individuals needed for a species to maintain or increase its numbers in a region is the _____
AURORKA [14]

Answer:

The given blank can be filled with minimum viable population.

Explanation:

The MVP or the minimum viable population refers to the lowest number of individuals or the minimum density of the population of a species that can thrive in a specific region. The term is generally used in the fields of ecology, biology, and conservation biology.  

The minimum viable population refers to the smallest probable size at which the population can prevail without encountering extinction due to demographic or natural disasters, genetic, or environmental stochasticity. Generally, MVP is utilized to signify towards a wild population, however, it can also be utilized for ex-situ conservation.  

7 0
3 years ago
Give an example of a theory and 1 example of a scientific law.
Vaselesa [24]

Answer:

A scientific law is simply an observation of the phenomenon that the theory attempts to explain. For example, suppose that you were lying under an apple tree and observed an apple fall from a branch to the ground. The observation of this phenomena can be called the law of gravity.

7 0
3 years ago
Cell differentiation refers to:
8090 [49]

Answer:

I am leaning towards D because everything changes during Cell differentiation the functions changes and goes through many different cycles.

Explanation:

3 0
3 years ago
How is a dicotyledonous leaf adapted for maximum sunlight and carbon dioxide for photosynthesis? 20 Points if ya help meh out lo
jok3333 [9.3K]

Answer:

They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out. Although these design features are good for photosynthesis, they can result in the leaf losing a lot of water. The cells inside the leaf have water on their surface. Some of this water evaporates, and the water vapour can then escape from inside the leaf.

5 0
2 years ago
The two main processes by which plant cells absorb, release, and use energy are
emmainna [20.7K]
<em>The two main process by which plant cells absorb, release, and use energy are Photosynthesis and respiration.</em>
5 0
3 years ago
Read 2 more answers
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