Growth stages in amphibians

Growth stages in amphibians (frog)

Frogs are animals that belong to a group called amphibians, meaning they can live both in water and on land at different stages of their life cycle. The growth process of a frog is called metamorphosis. Let's break it down into the stages in detail:

Diagram showing life cycle of frog illustration

Eggs

1. A female frog lays many eggs in water. These eggs are round and black, and they float on the water. They are arranged in jelly-like strings, with each egg separated from the others by the jelly.
2. The jelly around the eggs has an important job: it protects the eggs from being damaged and keeps them from drying out. This jelly helps the eggs stay safe until they hatch.

Tadpole stage

After two days, the eggs hatch, and tiny frog babies called tadpoles are released. The tadpole has three main parts:

1. The head (where the eyes and mouth are).
2. The trunk (the middle part of the body).
3. The tail (used for swimming).

Tadpoles look like fish because they have external gills (gills outside their bodies) that they use to breathe underwater. These gills are visible on the sides of the head and last for about four days. During this time, the tadpole is still feeding on plants and vegetation in the water.

Development of features

After three days, the tadpole starts to change. It develops internal gills (gills inside the body) that it will use for breathing. A week after hatching, the tadpole's body continues to develop:

1. The mouth becomes more developed.
2. Eyes begin to grow on the top of the head.
3. Diaphragm (a muscle used for breathing) starts to form to help with breathing. The tadpole still feeds on plants and breathes like a fish using its gills.

Growing limbs and lungs

After about one month, the tadpole begins to grow legs:

1. Hind legs (the back legs) begin to form first, followed by front legs.
2. Lungs also develop, allowing the tadpole to start breathing air instead of just using gills. At the same time, the tadpole's tail starts to shrink and shorten. As the legs grow and the tail shortens, the tadpole is beginning to change into a young frog.

Adult frog

Eventually, the tadpole becomes a frog. This process takes some time, and the frog undergoes many changes:

1. The frog's body becomes fully developed.
2. The frog can now live on land and breathe using lungs.
3. It can also jump, swim, and live in both water and on land, which is why frogs are called amphibians.