Because since their ancestors came before them then they inherit certain beneficial traits that help them survive. Those traits are in the DNA and the animals are evolving to be more fit for the environment that they are in. (hope this helps)
Stewardship is taking care of something like a large household, the arrangements for a group or the resources of a community. An example of stewardship is the responsibility of managing the staff of an estate. An example of stewardship is the act of making wise use of the natural resources provided by the earth.
B-valine,histidine,threonine,phenylalanine
Sex linked inheritance usually occurs on the X chromosome. Males have one X, meaning if they receive the specific sex linked gene, they will have the trait. However for a female to possess the trait, she must receive 2 X chromosomes for that trait.
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Can please add some detail to your question...
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