1/4 recessive can be expected for the recessive trait of mono hybrids from the F2 generation.
Option D
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Explanation:</u></h3>
Mono hybrid cross is defined as the crossing between two plants considering the two different alleles of a particular character. It was 1st performed by Father of Genetics, Sir Gregor Mendel. The mono hybrid cross done by him considered the character tallness of garden pea plants, of which one was tall and other was short.
He crossed them to get all tall plants in 
Filial generation. Now as he self bred those plants, he got the tall and short plants in ratio of 3:1. Thus he proved that the recessive trait of mono hybrids is 
of the total population of F2 generation.
The seasons are caused by the Earth tilting.The seasons change depending on the sunlight hitting the earth.For example:Winter happens when the hemisphere is tilted away from the sun.The earth rotates around the sun the whole year.Hope that helped.
The answer is A. Excretion I hope this helps
Here's a picture to help explain and show the steps:
Much less energy is released during anaerobic respiration than during aerobic respiration. That is because the breakdown of glucose is incomplete. Anaerobic respiration produces an oxygen debt. This is the amount of oxygen needed to oxidise lactic acid to carbon dioxide water.
