Two groups of related living things are no longer considered to be the same species when a. They can no longer interbreed.
b. They do not eat the same food.
c. They do not look the same.
d. They become physically separated from each other.

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.

the tricuspid valve is present between right atrium and right ventricle

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.