Identical twins in humans, which are deuterostomes, are formed when cells at the four-cell
stage are separated. a grasshopper, which is a protostome, will die if the cells are separated at
the four-cell stage. what does this indicate about when the cells are differentiated in the
zygote? why might deuterostomes differentiate their embryonic cells later than the
protostomes?

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

six grader is what i am ssorry

not: both offer magnification to the atomic level.