Answer:
Frequency of the allele "r"causing the disease on Tristan da Cunha
%
Frequency of the allele "r"causing the disease in the original population of 15 colonists 
%
Explanation:
Frequency of the allele "r"causing the disease on Tristan da Cunha
Given -
Out of 240 descendants on the island, 4 had retinitis pigmentosa (rr).
As per Hardy Weinberg's equllibrium equation
The frequecy of recessive individual in a given population is represented by 
And q represents the frequency of allele r
So, in this case q is equal to
%
Frequency of the allele "r"causing the disease in the original population of 15 colonists
As it is given in the question statement , the frequency of allele "r"causing the disease in the original population of 15 colonists is ten times the frequency of the allele "r"causing the disease on Tristan da Cunha
i.e
%
<h3><u>Answer;</u></h3>
C. Energy is transferred from organisms in one level to those in the level above.
<h3><u>Explanation;</u></h3>
- Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.
- As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat.
Answer:
The correct answer is c. smoking
Explanation:
Cigarette contains tobacco and it is identified that cigarette smoke has up to 7000 chemicals out of which 250 are poisonous and 70 chemicals are found to be carcinogenic.
Smoking is the main cause and greatest risk factor for bladder cancer. The person who smoke regularly are 3 times more prone to get bladder cancer than non-smokers. Smoking causes cancer in other organs and tissue like lungs, mouth, esophagus, throat, liver, pancreas, stomach, etc. Therefore the correct answer is c.
After the forest fire,the burnt wood will be fertilized by microbes which consider as decomposer in the food chain.It doesn't olny decompose dead animals but also organic and inorganic resources.
