Explanation

In earthworms, the skin serves as the organ of respiration.

This type of respiration is called cutaneous respiration.

The skin is thin, transparent, moist and richly supplied with blood capillaries.

Explanation

Prokaryotic cells lack membrane-bound organelles.

They do not have structures like a nucleus, mitochondria, or endoplasmic reticulum.

They are characteristic of eukaryotic cells.

Explanation

The breakdown of glucose by microorganisms, such as yeast, is called alcoholic fermentation.

Explanation

The mantle is a feature of mussels and other mollusks, responsible for secreting the shell.

Explanation

The canal system is a characteristic of Porifera (sponges), used for water circulation and filtration.

Explanation

Sharks belong to the class Chondrichthyes, which includes cartilaginous fishes.

Explanation

The alkaline mucus secreted by the Cowper's glands also plays an important role in neutralizing the acidic nature in the urine.

Explanation

Bacteria that lack flagella are called atrichous.

Explanation

The embryological stages of all vertebrates show similarities in anatomical features, reflecting a common evolutionary origin.

Explanation

The wings of birds and flying lizards are examples of convergent evolution, where different species evolve similar traits independently, often due to similar environmental pressures.