The term “seafloor spreading" is best used to describe-* the rapid drop off between the continental shelf and the abyssal plain.
the submergence of the Pacific plate beneath the North American plate.
the tsunami effect associated with the eruption of underwater volcanoes.
magma upwelling and lateral expansion along the mid-Atlantic ridge

magma upwelling and lateral expansion along the mid-Atlantic ridge

Explanation:

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.

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