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3 years ago

Bioaccumulation of this chemical lead to bird eggs with weak shells and nonviable offspring:

2 answers:

7 0

Bio accumulation of DDT lead to bird eggs with weak shells and non viable offspring. The lethal effects of DDT on birds was first noted in 1950; scientists discovered that earthworm was accumulating the DDT pesticide and that the robins that were preying on the earthworms were been poisoned. Further research revealed that the chemical cause thinning of the egg shell and production of non viable offspring. The chemical has since been banned in USA.

ELEN [110]3 years ago

6 0

Bioaccumulation of the chemical DDT lead to weakened shells in birds, especially those of eagles.

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Paul ekman and walter friesen traveled to new guinea to study the meaning of various facial expressions in the primitive south f

konstantin123 [22]

The conclusion they reached was that the six major emotional expressions appear to be universal.

<h3>What are facial expressions?</h3>

Facial expressions are the various movement of the face that shows the emotional state of an individual.

The six major emotional expressions are :

anger,

happiness,

fear,

surprise,

disgust and sadness.

These are be expressed by any individual in any part of the world.

Therefore, the conclusion they reached was that the six major emotional expressions appear to be universal.

Learn more about emotion here:

brainly.com/question/4692301

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2 years ago

Which statement is true about flood risk in the United States? Floods happen every few years and are usually only mild. Floods h

Luba_88 [7]

<span>Floods are the country's number one natural disaster.</span>

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3 years ago

Biology End of Year Cornerstone Assessment

marshall27 [118]

Answer: hypothesized that the higher pH levels would increase the rate

of movement of the Artemia. The students placed the Artemia in petri dishes with 2 mm x 2

mm grids marked off on the bottom of the dishes. The students calculated how fast the Artemia

traveled in each pH (4-9) solution by counting the number of squares on the grid that the

Artemia crossed per second of timing.

The data collected from their experiment is presented below:

pH of Water

Rate of Movement of

Artemia

(squares per second)

1. Using the grid below, create a graph based on the above data.

Explanation: yes

6 0

2 years ago

Why was molecular testing necessary to establish that species Z was closely related to Butanol Curus? In other words, why couldn

azamat

Answer:

Because it is only possible to be 100% sure that two species are closely related, in genetic terms, when the DNAs of these species can be analyzed. This analysis is only possible through molecular tests.

Explanation:

Molecular tests are bikini techniques that can analyze species at the molecular level, more specifically, these tests can deeply analyze the DNA (or RNA and proteins) of a species giving precise results on the molecule and allowing scientists to study it deep.

In studies, where the scientist wants to know how the species are genetically related, it is common for molecular tests to be introduced, as a way for the scientist to be 100% sure of the relationship between the species.

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3 years ago

Many sexually active american adolescents fail to avoid pregnancy because

Damm [24]

<span>Many sexually active american adolescents fail to avoid pregnancy because they are not educated on contraceptive methods. </span>

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3 years ago