Which statement best describes Mendel's experiments?

A. he began with hybrid plants
B. he controlled pollination
C. he only observed one generation
D. he used plants that reproduced slowly

B

Explanation:

Mendel needed to control the plants' pollination, because he wanted to selectively breed the plants and observe the results.

Why not A: He began with purebreeding plants, so he could trace alleles exactly.

Why not C: He observed so many generations! It's important in an experiment to have as large a sample size as you can without being too large.

Why not D: Part of the reason he picked pea plants is because they reproduce quickly, so he could measure efficiently.

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.

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.