Echinoderms, they are among the most common invertebrate animals in the marine environment of virtually any part of the world, among them we can find species such as sea cucumber , salmon and cod fish, they have chamois cloth like outer layer, then we have the Crinoids, another example of marine species with feather, popularly they are called sea lilies and feathery stars, they have a solid calcite skeleton; they were so abundant in the paleozoic seas that their remains formed large limestone thicknesses.
Answer: I think number 2 b
Explanation:
The molecules that brings amino acids to the ribosomes are the tRNA molecules.
The electrical property of the membrane changes. There is a small undershoot in the membrane potential.
