Element a has a half-life of 10 days. a scientist measures out 200 g of this substance. after 30 days has passed, the scientist reexamines the sample.
how much element a will remain in the sample?
50 g
25 g
12.5 g
100 g

25 g of an element will remain in  the sample.

Explanation:

Initial mass of an element =

Final mass of an elemnt after time ,t = N

t = 30 days

Half life of an element =

N = 25.01 49 g ≈ 25 g

25 g of an element will remain in  the sample.

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous