Littering, hunting specific endangered species, honestly there are tons of things so the easiest one would be littering because if animals eat certain things it can kill them.
Not sure about the answer but I think its the size of the system
Answer:
Species adapted to drier environments will replace species less suited to the new climate.
Explanation:
The X chromosome from the father with hemophilia will have the hemophilia gene. The girl also gets an X chromosome from her mother. If she gets the normal X chromosome, the girl will be a carrier.