Answer:
naturally living organisms
<span>The scientific view's order of Earth's first living things to the most recent is described by choice C. cyanobacteria, hagfish, crocodilians, giant ground sloths. Cyanobacteria have lived on the Earth since the Precambrian supereon. Actually, they first appeared in the Archean eon (4-2.5 billion years ago). Hagfish, as other jawless fish, appeared in the Paleozoic era (541-252 million years ago). Crocodilians appeared in the Cretaceous period (145-66 million years ago). Giant ground sloths, also known as megatherium, appeared in the Pliocene epoch (5.33-2.58 million years ago).</span>
Mangroves swamps or forests are productive wetlands and grow in saline and humid climates. They play an important role in fisheries, coastal protection and wildlife habitat.
<h3>What is the importance of mangrove forests?</h3>
The mangroves are located in the subtropical and the tropical region where the climate is high in humidity and have saline and waterlogged forests.
The mangroves interact with the ecosystem through various means and help other aquatic organism for shelter and reproductive sites.
They help the ecosystem in maintaining water quality and help in coastal protection along with aiding the wildlife habitat. The fishes reside in the roots and the forests structures and lay their eggs.
Therefore, option d. all of the above is correct.
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Cardiovascular system provides individual cells with oxygen and nutrient which helps in disposing metabolic wastes.
