what are the body systems on taking notes, looking at what’s on the board, listening to what the teacher is saying, and thinking about what’s going on.

I think I understand now! Body systems are groups of organs and tissues that work together to perform important jobs for the body. Some organs may be part of more than one body system if they serve more than one function. Examples include the respiratory system, nervous system, and digestive system. These different body systems include the skeletal, nervous, muscular, respiratory, endocrine, immune, cardiovascular/circulatory, urinary, integumentary, reproductive, and digestive systems. If this answers the question then this is right

Explanation:

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.