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givi [52]
3 years ago
8

An example of an indicator species is the sea otter. Without sea otters, sea urchins would overgraze on kelp beds, dramatically

changing the marine community.
True
False
Physics
2 answers:
sveticcg [70]3 years ago
7 0

the answer is false

qwelly [4]3 years ago
5 0

Answer:The answer is false hope this helps

Explanation:

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An elements atomic number is 85 how many protons would an atom of this element have?
garik1379 [7]

85 protons are in astatine have.

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3 years ago
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Which statement best describes the relationship between an object's density and its index of refraction? as the optical density
babunello [35]
For future references, the answer is B.
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2 years ago
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A ray of light passes from one material into a material with a higher index of refraction. Determine whether each of the followi
nikitadnepr [17]

Answer:

a) the Angle te also decreases , b) decrease, c) unchanged , d) the speed decrease , e) unchanged

Explanation:

When a ray of light passes from one transparent material to another, it must comply with the law of refraction

     n1 sin θ₁ = n2 sin θ₂

Where index v1 is for the incident ray and index 2 for the refracted ray

With this expression let's examine the questions

a) They indicate that the refractive index increases,

      sin θ₂ = n₁ / n₂ sin θ₁

     θ₂ = sin⁻¹ (n₁ /n₂   sin θ₁)

    As m is greater than n1 the quantity on the right is less than one, the whole quantity in parentheses decreases so the Angle te also decreases

Answer is decrease

b) The wave velocity eta related to the wavelength and frequency

      v = λ f

The frequency does not change since the passage from one medium to the other is a process of forced oscillation, resonance whereby the frequency in the two mediums is the same.

The speed decreases with the indicated refraction increases and therefore the wavelength decreases

      λ = λ₀ / n

The answer is decrease

c) from the previous analysis the frequency remains unchanged

d) the refractive index is defined by

       n = c / v

So if n increases, the speed must decrease

The answer is decrease

e) the energy of the photon is given by the Planck equation

      E = h f

Since the frequency does not change, the energy does not change either

Answer remains unchanged

7 0
3 years ago
New seafloor material is formed at places in Earth’s crust where –
mr_godi [17]

Answer:

D, I think.

Explanation:

I had a quiz in Plate Tectonics and there was 2 questions that are related to this, but not the exact question.

Which material rises from cracks in oceanic crust

-molten rock

Which is the first step in the seafloor spreading process?

-a crack forms in oceanic crust.

those are all right btw, so you can decide if the answer I told you is right or not.

4 0
2 years ago
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Help ASAP 100 points
Gwar [14]

Answer:

other galaxies is red shifted

Question 5 (1 point)

What does a blue shift in light from stars indicate?

Question 5 options:

The stars are moving randomly.

The stars are moving closer.

The stars are moving farther away.

The stars are stationary

7 0
2 years ago
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