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Bad White [126]
3 years ago
6

List the advantages and disadvantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersi

stent organophosphate pesticides. have the benefits of this switch outweighed the disadvantages? explain.
Biology
1 answer:
expeople1 [14]3 years ago
3 0
Persistent chlorinated hydrocarbon pesticides persist in the environment and accumulate in the foods chain causing harmful effects on the environment including posing a threat to humans health in the long term. Nonpersistent organophosphate pesticides are more toxic than the former but degrade after a short life span. Therefore they cause immediate harm in case one is in contact with them.
The fact that they do not accumulate in the environment, they are more favourable than chlorinated hydrocarbon pesticides. Chlorinated hydrocarbon pesticides will affect several generations due to their accumulation in the environment. However they don't need to be re-applied hence are less expensive
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Which of the following is a characteristic by which viruses are classified?
liq [111]

Answer:

Type of nucleic acid.

Explanation:

Virus may be defined as the organism that can contains both DNA and RNA as their genetic material. Virus acts as non-living outside the host environment and later acts as living organism inside the host.

Some virus that particularly contain DNA as genetic material. Some virus has the ability to transform RNA into the DNA molecule. Some virus contains only RNA as their genetic material and DNA is not involved in their life cycle.

Thus, the correct answer is option (a).

4 0
3 years ago
what effect does the presence of existing soil in secondary succession have on the amount of time it takes to return to the clim
bezimeni [28]
The primary succession takes a long time to be done. the secondary succesion takes 200-500 years for completion. the secondary succession occurs in an area which has been denuded recently and lately inhabited. soil is present at the beginning of the secondary succession with some organisms. thank you for this question.
7 0
3 years ago
Help please asap
vovangra [49]

Answer:

a. Directional selection favors one end of the phenotype distribution, whereas

stabilizing selection favors intermediate over extreme phenotypes

Explanation:

Directional selection is called directional because it favors one phenotype over another, and stabilizing selection finds a balance between phenotypes.

7 0
3 years ago
The frequency of sickle-cell anemia, an autosomal recessive condition, is 0.007. Assuming that the population is in H-W equilibr
damaskus [11]

Answer:

The correct answer is - 0.084

Explanation:

Sickle cell anemia is a autsmal recessive blood disorder of RBCs where RBC shape altered to the sickle shape or cresecent moon that obstruct and damage the veins and artries.

Normal allele is represented by - HbA - p

sickel cell allele is represented by - HbS - q

genotype frequency of normal allele HbA in the population = p2

genptype frequency of HbAHbS in the population = 2pq

genotype frequency of autosomal recessive HbS = q2 = 0.007 (given)

So, the allelic frequency of the recessive allele =

q =  √ 0.007 = 0.08366 or 0.084

5 0
3 years ago
Things too small to be seen with other microscopes may be viewed with an
Andrei [34K]

Things too small to be viewed by a light microscope can be viewed with an Electron Microscope



Hope this helps!

4 0
3 years ago
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