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Jlenok [28]
3 years ago
14

Where did DDT come from?

Biology
1 answer:
laiz [17]3 years ago
8 0

Answer:

Originally developed as an insecticide, it became infamous for its environmental impacts. DDT was first synthesized in 1874 by the Austrian chemist Othmar Zeidler. DDT's insecticidal action was discovered by the Swiss chemist Paul Hermann Müller in 1939.

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Which of the following is not a characteristic of all life
Alexeev081 [22]

the answer could be breath oxygen or respond to stimuli. Hope this helps!

8 0
3 years ago
Which of the following is not a natural cause of extinction?
dedylja [7]

Answer:

Introduction of Non-native species would be the answer. ( B )

Explanation:

Now let's break it down.

A. Competition due to overpopulation

Competition due to overpopulation, as competition of resources rises, species will fight among each other, and slowly, population will go down. But I don't see the reason of why it would cause an extinction... perhaps a decrease of population. See, once populations starts decreasing, resources will increase. And ONCE resources increase, populations starts increasing, and there goes competition. Resources decreases, populations decreases, and the whole process repeats. So I'm not quite sure whether it will cause extinction of a species.

B. Introduction of Non- native species.

So what does it mean by Non-native species?

It means that species that have no effect and doesn't exist in the ecosystem. So that will definitely not affect the population whatsoever.

C. Catastrophic Events

Well, common sense. Many people died of tsunamis, tornado and other natural disasters every year. Too many disasters can cause the population to cease.

D. Disease

This we can relate, especially the Coronavirus. Many humans died of the deadly virus. Same goes to animals. If a disease gets too deadly, population will decrease and drive the species to extinction.

So, the Answer would be B.

<h2>HOPE THIS ANSWER HELPED :)</h2>
3 0
3 years ago
What is mass ?write any 3 untits of mass​
Klio2033 [76]

Explanation:

mass is a weight ofan object .

6 0
3 years ago
1.some of the fossils that have been found from before the cambrian explosion are embryos this suggests that the organisms these
Helen [10]

It's D,C,C this is the answer

8 0
3 years ago
Read 2 more answers
A postbirth complete blood count (cbc) has noted an elevated white blood cell (wbc) count of 22,000/mm3. which rationale is accu
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This is a normal variation due to stress of labor
The level of white blood cells in the body vary due to the amount of external stress that is placed on the body. The level indicated, 22,000/mm³ is within this range, which extends up to 30,000/mm³ for women after delivery. Because this is well within the normal range, there is no need to retest the value obtain neither is there a need to administer antibiotics.
7 0
3 years ago
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