<span>A collection of mechanisms, behaviors and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced are sterile :)</span>
Answer:
Can you provide us with a picture of the graph?
Explanation:
No one can answer the question if we can't even see the graph you're asking about.
When you shiver, that's actually how you help yourself stay warm! It's your immediate instinct reaction to do so when you're cold, so there will be more heat produced, and they occur by your muscles moving. =)
9:3:3:1 would be the expected phenotypic ratio
