Eric is observing various types of eggs and trying to correlate them with the mode of fertilization. One of the eggs has a calcareous shell with a large amount of yolk. Another is wet with a moderate amount of yolk and with many coatings of jelly above it. What could be the mode of fertilization of the animals to which they belong?Select one of the options below as your answer:A. External and internal, respectively B. Internal and external, respectively C. Both external

The first egg has a calcareous shell, so we can imagine it is a dry and hard shell, and the egg has a large amount of yolk. These are characteristic of an egg generated from the internal fertilization, where the union of gametes occurs within the animal's body. During copulation the male uses his genitals or copulators to release sperm into the female's body, which results in an egg similar to the one described in the above question. Birds have this type of fertilization.

The second egg has a wet appearance, with gelatinous substances on its surface. These are characteristic of eggs resulting from external fertilization, where gametes fuse outside the female's body in the environment. In external fertilization, there must be water for the male gametes to move to the female. In addition, males need to eliminate large numbers of gametes to ensure they reach the eggs. Fish have this kind of fertilization and this kind of egg.