Yolks are an important component of the eggs since they
nourish the young embryo as it develops into a young juvenile organism. The
yolk is important especially when the embryo is not attached to its parent (in
oviparous organisms) like in humans. Humans embryos are able to get their
nourishment directly from their mothers in the womb (through the placenta)
hence don’t require a yolk (viviparous organisms).
There are three parts to this theory. The first part states that all organisms are made of cells. The second part states that cells are the basic units of life. These parts were based on a conclusion made by Schwann and Matthias Schleiden in 1838, after comparing their observations of plant and animal cells.
The significince about them as they think they came from the moon as i do mot know much about it you may be better by searching it up
I think the correct answer from the choices listed above is option D. Plamids is the term for replicating circular pieces of DNA that often carry antibiotic-resistant genes. Plasmid is a kind of small circular DNA which contains at least one gene. One of the gene is the antibiotic-resistant gene.
In an atom, the number of protons is almost always equal to the number of electrons