Unicellular vs Multicellular

Unicellular organisms are those that are composed of a single cell, while multicellular organisms are those that are made up of multiple cells.

Algae

Algae are a diverse group of aquatic organisms that can be found in a variety of environments, from freshwater to saltwater. They can be either unicellular or multicellular, depending on the species.

Plantae

Plants, which belong to the kingdom Plantae, are multicellular organisms that are capable of photosynthesis. They are made up of a variety of specialized cells that work together to carry out the functions necessary for growth and survival.

Protozoa

Protozoa are a group of unicellular eukaryotic organisms that are found in a variety of environments, including water, soil, and the digestive tracts of animals. They are capable of a wide range of metabolic activities, including photosynthesis, and are an important part of many ecosystems.

Animalia

Animals, which belong to the kingdom Animalia, are multicellular organisms that are capable of movement and are characterized by a wide range of specialized tissues and organs. They are found in a variety of environments, from the depths of the ocean to the highest mountains.

Why is the answer A?

The answer to this question is A because algae can be either unicellular or multicellular. Some species of algae, such as Chlamydomonas, are unicellular, while others, such as kelp, are multicellular. Therefore, it is not possible to make a clear distinction between unicellular and multicellular when it comes to algae.