Answer;
Primitive streak.
At the onset of the embryonic period, the primitive streak appears. It will eventually become the neural tube.
Explanation;
The primitive streak is a transient structure which forms on day 15 of human development.
It marks the start of gastrulation; the process in which the inner cell mass in converted into the trilaminar embryonic disc.
It originates from the anterior epiblast.
Answer:
Efficiency is the percentage of energy actually used to perform the work.
Answer:
B
Explanation:
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It is the rib cage (thoracic cage)
To be able to compare the results to a sample without any of the independent variable added.
