This is caused by a genetic 'switch' where the animals all derived from a particular ancestor....hope this helps
Things around us are usually made up of combinations of elements. These combinations are called molecules. Molecules make up combinations called compounds.
Water is an example. There are 2 oxygen atoms and 1 hydrogen atom (oxygen and hydrogen are elements). Together there molecules make up H2O (water) which is a compound.
I hope this makes sense! I'm happy to answer any other questions you might have :)
Exhaled air has a higher concentration of CO2 and the lungs are humidified within
An autosomal trait is a characteristic arising from genes located on chromosomes that are not gender determining.
