Why is it dangerous for your cells if you drink seawater? (For full points, you must include the appropriate tonicity terms and describe what would happen to your cells)
please help, its for a quiz

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

the answer is sex-linked recessive.