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Setler [38]
3 years ago
7

The beaks of finches found on various Galapagos Islands

Chemistry
2 answers:
Advocard [28]3 years ago
6 0
C. The available food supply I think not sure but if not I’m sorry
Anvisha [2.4K]3 years ago
5 0

Answer:

c the available food supply

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About _____ percent of the energy in an organism is used by the animal that eats it.
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About 25 percent of energy in an organism is used by the animal that eats it .

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Processes on and near Earth’s surface produce _____ rocks
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The naturally occurring radioactive decay series that begins with 23592U stops with formation of the stable 20782Pb nucleus. The
dsp73

Answer: There are 7 alpha-particle emissions and 4 beta-particle emissions involved in this series

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.

In radioactive decay the sum of atomic number or mass number of reactants must be equal to the sum of atomic number or mass number of products .

_{92}^{235}\textrm{U}\rightarrow _{82}^{207}\textrm{Pb}+X_2^4\alpha+Y_{-1}^0e

Thus for mass number : 235 = 207+4X

4X= 28

X = 7

Thus for atomic number : 92 = 82+2X-Y

2X- Y = 10

2(7) - Y= 10

14-10 = Y

Y= 4

_{92}^{235}\textrm{U}\rightarrow _{82}^{207}\textrm{Pb}+7_2^4\alpha+4_{-1}^0e

Thus there are 7 alpha-particle emissions and 4 beta-particle emissions involved in this series

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3 years ago
Pls help me i have been seeing people giving out the wrong answers on purpose and I just don't want that so pls
fiasKO [112]

Answer:

B

Explanation:

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A is correct .

please vote my answer brainliest. thanks!
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