Which of the following is the contraction phase of the cardiac cycle?

Afamily has a y-linked disease that affects the father. what is the chance of a male offspring inheriting the same disease? oa. 100% ob. 50% oc. 25% d. 0%

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

One of the reasons that stars are so large is because