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Andrew [12]
3 years ago
5

In 1939, the use of DDT (a powerful synthetic chemical) as an insecticide was discovered. The United States adopted its widespre

ad use, producing up to 100 million kilograms per year (200 million pounds per year). Twenty years later, severe side effects started to be reported as a result of DDT use. Which was an advantage of using DDT?
insect and pest populations decreased

birth defect rates increased

cancer rates increased

fertility rates decreased
Biology
2 answers:
olganol [36]3 years ago
7 0
The answer is <span>insect and pest populations decreased.
</span>

DDT (dichlorodiphenyltrichloroethane) was used as an insecticide which is a substance used to kill insects. That resulted in decrease in insect and pest populations. It is a persistent and non-degradable insecticide, but as well organic pollutant readily accumulated to soils and consequently affects organisms.
nordsb [41]3 years ago
7 0

Answer:

A. insect and pest populations decreased

Explanation:

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Answer:

<em>Test group is a group that is modified or </em><em>changed by the researcher </em><em>and is then compared to the </em><em>experimental group while carrying out an experiment. </em>

Explanation:

While observing the data of the test group, it has to be compared with the control group to see if there is any effect of the treatment on the test or not. The control can be positive or negative or both to which the test group is compared.

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If meiosis did not occur during the formation of gametes, sexual reproduction
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Explanation:

hope it helps .

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3 years ago
Attached earlobes are recessive to free earlobes. If two heterozygous individuals have a child, what is the probability of the c
Sunny_sXe [5.5K]

Answer:

probability of the child having attached earlobes since it is recessive i.e (yy)

=1/4

=0.25 × 100%

=25%

Explanation:

If two heterozygous individuals have a child

i.e let the heterozygous individuals be  = Xy

if both traits crosses together; their F₁ offspring will be;  (XX, Xy, Xy, yy)

Xy  ×   Xy

          X             y

X        XX          Xy

y       Xy            yy

probability of the child having attached earlobes since it is recessive i.e (yy)

=1/4

=0.25 × 100%

=25%

4 0
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