Answer:

1. Butterfly: Internal

2. Mosquito: External

3. Frog: External

4. Cat: Internal

5. Dog: Internal

Explanation:

•Butterflies:

Coupling: Butterflies mate on the ground or in the air; internal fertilization of the eggs takes from a few seconds to many minutes or hours. During mating, the male transfers a sperm packet (called a spermatophore) into the female; these sperm will fertilize the female's eggs.

•Mosquito:

The female mosquito stores the sperm she received through mating, and eggs are fertilized at the time they are laid. The development time of the egg is about 1-2 days, and during this period the egg turns from white to black as its outer shell hardens to protect it from a hostile environment.

•Frog:

Typically, frogs lay eggs. This process usually occurs through external fertilization, where the female releases her eggs from her body into water. Then, the male releases his sperm to fertilize them. However, a few species of frog use internal fertilization.

•Cat:

Cats do not ovulate or release eggs into the fallopian tubes and into the horns of the uterus so that they can be fertilized until they have mated – unlike other animals which already have the egg in situ when mating occurs.31 Jul 2018

•Dogs:

Canine sperm can live for 10 to 11 days in the uterine tubes (fallopian tubes) so if a female is bred 10 days before the oocytes (eggs) can be fertilized, she will appear to have a gestation length of 70 days. If she is bred on the day the oocytes can be fertilized, her gestation length will appear to be 60 days long.

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