Genetic disorders can be caused by a

Genetic disorders can be caused by a mutation in one gene, by mutations in multiple genes, by a combination of gene mutations and environmental factors, or by damage to chromosomes.

like body hair ? if its that its beacuse it keeps you warm from the cold or if u mean hair from your head for you to look good

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answer: my answer would be a) scheduling workouts with your friend for consistent days and time

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for me personally i would be much more likely to go to the gym with a friend because i wouldn't want to cancel on them or stand them up.