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hoa [83]
3 years ago
12

Why don't animal cells need chloroplasts?

Biology
1 answer:
vovikov84 [41]3 years ago
3 0
Animals don’t need to absorb sunlight in order to live. Only plants have chloroplasts to absorb the rays from the sun which is required for them to live and grow
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A slice of pizza has 500 kcal. If the pizza is burned and its heat is used to warm a 50-L container of cold water, what would be
Vinvika [58]
Given:
The heat content of the pizza is  Q = 500 kcal 
The volume of the cold water is V = 50 L
The mass of a liter of cold water is 1 kg.

Calculate the mass, M,  of cold water.
M = (50 L)*(1 kg/L) = 50 kg 

The specific heat of water is
c = 4.184 kJ/(kg-K)

Also,
1 kcal = 4184 J, therefore
Q = (500 kcal)*(4184 J/kcal) = 2.092 x 10⁶ J

Let ΔT = increase in temperature of the cold water, °C (same as K).
Then
Q = M*c*ΔT
or 
ΔT = Q/(M*c)
\Delta T =  \frac{(2.092 \times 10^{6} J)}{(50 \, kg)(4.184 \times 10^{3} \,  \frac{J}{kg-K)}) } =10 \,K=10 \,^{o}C

Answer: The temperature increases by 10 °C (or 10 K)
4 0
3 years ago
Which is an abiotic factor that can be found in a rain forest ecosystem?
Ivanshal [37]
Abiotic factors are things in an ecosystem that aren't alive. 

Here are a few examples of abiotic factors in a rain forest:

1. Sunlight
2. Water
3. Soil
4. Rocks

Hope this helps!
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Which type of selection leads to increased phenotypic and genetic variation?
irina [24]

Answer:

Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.

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Explanation:

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How do mutagens damage DNA?
nikklg [1K]

Answer:

Some mutagens strip DNA nucleotides (bases) of essential modifications—for example, they deaminate the bases—such that these bases resemble different nucleotides and confuse the DNA replication machinery. Subsequent rounds of DNA replication then permanently incorporate such changes.

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