Answer:
B. It is done by humans to select certain traits useful to us.
Explanation:
There are two main types of selection: natural and artificial. Natural selection is all of the other answers, it is seen over generations and allows the fittest to survive. It also occurs with no human intervention. However, artificial selection is done by humans. It occurs when humans breed animals to best fit their needs. This is best seen in dog breeding.
Answer:
The correct answer will be-Orbicularis oris muscle
Explanation:
The muscle which is present in the mouth is known as the oribicularis oris which consists of various muscular fibres in a different direction.
The oris muscle is derived from the other facial muscles inserted into the lips and join with the lips controlling the movement of the lips.
The muscle controls the movement by pulling down the corners of the mouth and the lips along with other muscles like the mentalis, the triangularis and the risorius.
Thus, Orbicularis oris muscle is the correct answer.
Explanation:
As the two plates move away from each other in a divergent boundary, the magma from the mantle beneath rises to replace the void created. The magma then cools into a new crust. Before the magma cools, the iron minerals align themselves with the magnetic fields of the earth due to their ferromagnetic properties. These cause the rocks after they are cooled to seem to have bands.
Due to magnetic reversals of the earth's magnetic fields (i.e change in magnetic north and south poles) over several hundred thousand years, these bands will orient differently depending on the then earth magnetic polarity when the magma was cooling.
Learn More:
For more on seafloor spreading check out;
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The lion population will decrease because their prey is being hunted
Answer: conditioned
Bobby touches his newborn brother's palm, and his little brother takes hold of Bobby's finger and will not let go. This is known as the conditioned reflex.
Explanation:
A conditioned reflex is a response or behaviour learned after birth. So, once the newborn acquires this learned response, they can perform them even without thinking about it.
Thus, Bobby's brother (the newborn) holding on to his finger and not letting go shows that it is a conditioned reflex