Flatworms only has one opening that they use for digesting and excretion of wastes. They do not have a true body. The opening is contains a part that is used to vacuum in food called flukes which can have a pharynx. Flatworms are flattened invertebrates. That lives as a parasite.
The correct answer is connective tissue.
Connective tissue is a tissue with the function of connection, derived from the mesoderm. It is found in between other tissues everywhere in the body where it supports and binds them. Connective tissue consist of a ground substance, fibers, and cells. It ypically has cells that are scattered throughout an extracellular matrix of fibrous proteins and glycoproteins which are attached to a basement membrane.
Answer:
sunlight, carbon dioxide, and water as substrates
Explanation:
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