The answer is b it is being bred for a trait that is favored by humans
The controlled experiments are performed by the scientists, when they want to study the changes in the sample on changing a single variable. So, the correct answer is option (b).
In case, all variables are kept same, no changes would be observed in the experiment sample. A controlled experiment can be performed on living thing as well as non living. But, controlled experiment cannot be performed on the things which are influenced by a lot of variables, as they cannot create realistic results. So, the option (a), (c), and (d) are incorrect.
Answer:
bc it has cities surrounding it
Explanation:
Answer:
high point of a wave = 5
low point of a wave = 4
time between the crest of one wave and the crest of the next wave = 2
vertical distance between a trough and a crest = 1
distance between two crests or two troughs = 3
