Hi
The answer is : C
Transcription Factors
The correct answer is; the open mouth of a baby robin is seen as a sign stimulus for the female robin (parent), and that the open mouth is the impending cause for her behavior.
Answer:
b progesterone
Explanation:
The plug is formed as soon as there is implantation of fertilized eggs. The thickness of the cervical mucus becomes different as hormone levels changes in pregnancy.
The progesterone, encourages the production of thick fluid/ mucus which brings about the formation of a plug. This prevents bacteria from getting into the uterine cavity.
Water used by the petroleum industry is injected deep underground and does not return to the hydrological cycle. The correct option is C.
<h3>Water and petroleum industries</h3>
Most of the water used in oil extraction is not returned to the hydrological cycle.
In actual fact, some percentage of the water used in extracting crude oil tends to be a source of pollutants to the freshwater reservoir in the environment.
With irrigation farming, this is not the case. Thus, many citizens will oppose the use of water by the petroleum industry but not irrigation farming.
More on the petroleum industries can be found here: brainly.com/question/25396009
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