Answer:
they may cause the development of a disease-causing allele
they may cause the development of a more beneficial allele
they in some cases, may have no noticeable affect
Explanation:
Streamlined bodies for swimming?
Lay her on the scale that would work
The zygote, a single cell, implants its self to the uterine wall and it developes into an embyro which is a cluster of cells.
2 is the answer I THINK look at other ones first
