It is A, sunlight. The variable is the type of light used, and the control is used to measure the effects of the variables, so since sunlight is the normal light, it is the control.
Label B is pointing t on the nervous
Pandas only blink sometimes because they are looking out for danger most of the time. Like other mammals, they have an upper and lower eyelid, so yes they do blink, but not as much as humans.
Answer:
1. by spraying them with insecticide
2. sucking the blood of animals and humans
Explanation:
In the first statement, it is said that the tsetse flies can be controlled by sterilizing. The statement form is similar to the first option where the verb of the sentence is is in the same tense and the subject of the sentence comes after the present continuous verb form.
Likewise, in the second sentence the verb tense coincides with the second sentence i.e option B
Hence the correct answers are
1. by spraying them with insecticide
2. sucking the blood of animals and humans
