If a couple has a boy, what is the probability that the next check will be a male

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

Which statement correctly compares metaphase i and metaphase ii? in metaphase ii twice as many chromosomes line up along the middle of the cell as in metaphase i. in metaphase i twice as many chromosomes line up along the middle of the cell as in metaphase ii. in metaphase ii twice as many chromosomes are pulled to opposite ends of the cell as in metaphase i. in metaphase i twice as many chromosomes are pulled to opposite ends of the cell as in metaphase ii.

One brief stimulus of a skeletal muscle may result in a single isolated contractile event, which is called a twitch. one twitch can generate max tension in a muscle. are these statements true or false?