Since this is movement that is occurring against the natural movement from high to low concentration, this is Active transport.
The option C.
It is the large intestine
Popliteus muscle
from: https://en.m.wikipedia.org/wiki/Popliteus_muscle
1. Amphibians has moist slimy skin meanwhile fish has scales.
2. Fish uses gills for breathing, but amphibians are different. Young ones uses gills, but adult amphibians uses lungs and even skin for breathing.
Examples of amphibians include frogs and toads.
Both fish and amphibians are one of the 5 types of vertebrates under animals. Besides fish and amphibians, other vertebrates includes mammals, reptiles and birds.
