An index card is placed across the top of a drinking glass. A coin is then placed on top of the index card. A student quickly flicks the card sideways off the glass. Which of these explains why the coin falls into the glass rather than moving to the side with the index card? a
Newton's second law
b
Newton's third law
c
Newton's first law
d
Newton’s law of universal gravitation

answer; /// i believe the correct answer is (thrombocytopenia); (a)

this is math not biology xd

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.