Aquatic and Marine Biology

A baby shark is commonly referred to as a pup.

Fish are aquatic vertebrates that possess gills for breathing and fins for movement.

Amphibians typically have smooth, moist skin and spend parts of their life cycle in both water and on land. Reptiles have dry, scaly skin.

A frog is a classic example of an amphibian, as it undergoes metamorphosis and lives in both aquatic and terrestrial environments.

A catfish is a type of fish, characterized by gills, fins, and living entirely in water. The other options are a reptile, an insect, and an amphibian.

Fish have fins, gills, and scales, but they do not have feathers. Feathers are a unique characteristic of birds.

Salmon acquire their pinkish-orange color from consuming krill and other small crustaceans rich in carotenoids like astaxanthin. Without this natural diet, their flesh would appear pale or grey.

In 2015, researchers identified a new species of shark, the Etmopterus benchleyi, which was nicknamed the Ninja Lanternshark due to its dark skin and bioluminescent properties.

Polar bears have black skin underneath their fur to help absorb heat from the sun. This is an adaptation for survival in arctic climates.

Sharks and rays are cartilaginous fish (Chondrichthyes), meaning their skeletons are made of cartilage rather than bone.

Sharks are cartilaginous fish, meaning their skeletons are made of cartilage rather than bone.

The whale shark is the largest known extant fish species. It can grow to lengths of over 40 feet.

The process of growth and development is regulated by thyroxine hormone which is produced by thyroid gland. Iodine is required for thyroxine production. That is why retarded growth is seen in tadpoles living in iodine deficient water. 

Benthos are organisms that live on or in the bottom sediments of a body of water, such as lakes or oceans.