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3 years ago

(06.03 MC) What is a reason that fossil fuels are often used as an energy source?

Biology

2 answers:

kaheart [24]3 years ago

5 0

Answer:

They are often used as an energy source because they are found everywhere and because it has a high energy output. Fossil fuels can be found where an animal dies, coal is found, a tree is burned etc. This makes them highly popular and strived for. They also let off a high amount of energy when burned so it is used for automobiles,electricity, cooking and more.

Explanation:

Setler [38]3 years ago

4 0

Fossil fuels are often used as an energy source because it is Easily and abundantly available

Explanation:

Fossil fuels are formed by natural processes, due to anaerobic decomposition. It is rich source of carbon. We depend on these sources to meet our daily requirement. These are renewable source of energy.

Fossil fuel are available abundantly and are easy to obtain and transport. They are much cheaper. Fossil fuels includes coal, oil, natural gas, petroleum together makes 80% of global energy source in all over the world.

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22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

The calculated  $X^2$  exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. 

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KATRIN_1 [288]

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3 years ago

What is the line of defence involved in phagocytosis

makkiz [27]

Answer:

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Explanation:

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