Which of these would most likely change the number of chromosomes found in a cell? A. A pair of chromosomes does not separate when a cell divides.
B. A set of chromosomes is duplicated when a cell divides by mitosis.
C. A chromosome in a cell has a sequence of bases altered by a mutation.
D. A pair of chromosomes in a cell overlaps and exchanges genes during meiosis.

the answer is

c. parental

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

i think that it is plants

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.