If you do not perceive a color change, or the emission of light or heat, it is still possible a chemical reaction has taken place.
A chemical change involves a change in the composition of a substance. It leads to the rearrangement of atoms and formation of a new substance.
Some cues may help us to know when a chemical change has taken place such as;
- Change in color
- Formation of a solid
- Evolution of heat
- Evolution of a gas
It is possible for a chemical change to occur without noticing these cues. For instance, two colorless solutions may react with each other and the product of the reaction remains colorless.
In this case, there is no physical cue signifying that a chemical change has taken place even though it actually happened.
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Answer:
See the answer below
Explanation:
a) The mode of inheritance of the bar mutant is X-linked and dominant.
Assuming that barness is represented by the allele B.
Bar female = 
or 
Wild type male = 
Bar female x wild type male:
x
All of the F1 flies are bar because a single B allele is required for the trait to be expressed.
Bar male x wildtype female
x 
All the female offspring are barred while all the males are wildtype barred resulting in a 50/50 (857/905 is approximately 50/50) ratio of barred/wildtype offspring.
b) Genotypes of each of the cross above, including the parents and the F1 generations.
1. x
2. x
A meander forms when moving water in a stream erodes the outer banks and widens its valley, and the inner part of the river has less energy and deposits silt. A stream of any volume may assume a meandering course, alternately eroding sediments from the outside of a bend and depositing them on the inside.
Yes the earth is changing due to the plate tectonics because when the earth ah earthquakes and all that kind of stuff here comes earth and reshapes it.
