We estimate around 20-30 trillion
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.
ATP and NADPH are made during light dependent reactions
Answer:
1. it's the cell membrane or just the cell itself
2. it's eukaryotic, I can tell because it's dividing
3. eukarya