Early land animals had to return to the water to reproduce.

The statement ‘Early land animals had to return to the water to reproduce.’ Is true. Their form of living before was based on the use of water as their food source and also, where females lay their eggs. They are called terrestrial animals.

The right answer is True.

Amphibians are the first vertebrate animals to come out of the water to land.

** In frogs and toads, there is mating but external fertilization in water. Indeed, males have rough balls on the legs to be able to hold on to females during mating and deposit their sperm as and when the female is laid. The eggs of the frogs are laid in packs, while the eggs of the toads are laid in ribbon. The females lay a lot of eggs, left alone in the pond, because predators of eggs or tadpoles are numerous in the pond!

The midwife toad male retrieves the ribbon of eggs laid by the female and wraps it around her legs and moves to the hatching eggs.

** In newts, there is no mating. After the courtship, the male deposits the spermatophore (a "sticky" bag containing sperm) in the water, then advances a few steps. The female who follows it, is obliged to stop in such a way that the spermatophore penetrates into her genitals and fertilizes her eggs. There is internal fertilization without mating! Then the female lays her eggs one by one in the pond and lays them gently on leaves that she folds around each egg to protect them.

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.