Orcas, or killer whales, are natural predators of sea otters. it has been observed that in regions where the sea otters are not present, sea urchins grow rapidly and destroy much of the natural kelp vegetation. which of these statements is correct in this context?

a) kelp is the keystone species because their survival is key to the survival of the entire ecosystem.

b) sea otters cannot be considered the keystone species because they are not the top predators in the ecosystem.

c) sea urchins are the keystone species because they multiply rapidly in the absence of their natural predators.

d) sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.

 D)  Sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.

The removal of a keystone species could cause their natural prey to multiply and destroy the dominant vegetation of the ecosystem. Kelp is the foundation species in the ecosystem. Sea urchins consume the kelp. If the sea urchin numbers are not kept in check by the sea otters, they will rapidly multiply and destroy the kelp vegetation. Therefore, sea otters are a keystone species as they prevent the herbivorous species from completely destroying a plant species.

~USATestprep~

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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