When a human's blood pressure increases, signals are sent from the blood vessels to the brain. Then, the brain sends a message to the heart, telling the heart rate to slow down. Is this an example of positive or negative feedback? How do you know? Explain how the situation could be the opposite (for instance, if you said that the example above is positive feedback, then explain a scenario where it could be negative feedback).

you keep track of variables in your data table.

the answer will be a) proteins i believe

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?