Why isn't coal considered a mineral?

1 answer:

8 0

Based on what I can make from thinking and mental observation, I think the reason being that coal isn't considered a mineral is that it is carbon based. In other words, its made from organic organisms (decayed organisms) which means that it doesn't have its own set of a defined element. While a mineral such as Iron (FE) has an atomic number of 26, electric configuration and a set atomic weight of 55.845. If there is an element feature such as this, you know for sure its Iron. Note: I got the element details because I have a periodic table chart right in front of my computer

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A researcher is curious if Bt resistant bollworms are susceptible to an insecticide called DDT. Bollworms susceptible to Bt have

Shalnov [3]

Answer:

The correct answer is - 3/16 or 18.75% portion will be resistant to both Bt and DDT.

Explanation:

It is given that bollworms that are susceptible to Bt are represented by either RR or Rr and resistance one are shown by rr genotype and bollworms that are resistant to DDT are represent TT or Tt genotype and susceptible to DDT have tt genotype.

Cross: RR tt with rr TT

Gametes: Rt and rT

F1 cross:

rT RrTt ( susceptible Bt and resistant DDT)

F1 Cross with F1

Gametes: RT, Rt, rT and rt

cross:

RT Rt rT rt

RT RRTT RRTt RrTT RrTt

Rt RRTt RRtt RrTt RrTt

rT RrTT RrTt rrTt rrTt

rt RrTt Rrtt rrTt rrtt

The bold genotypes are the three out of 16 that are resistant to both DDT and Bt.

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Elden [556K]

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I took a test with that same question and I got it right!.

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<span>Predator populations </span>
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