Question

question 1 (1 point)
kelp obtains its nutrients from ____________________.
the sediment through its roots.
by chemosynthesis.
symbiotic algae that live in its tissues.
primarily from river runoff.
the water column through the surface of its fronds.

Explanation:

Kelp is a type of brown algae. It lacks true roots; instead, it has holdfasts that anchor it to surfaces but do not absorb nutrients. Chemosynthesis is used by certain bacteria, not kelp. Symbiotic algae are characteristic of corals, not kelp. While river runoff may contribute nutrients to the water, kelp directly takes up dissolved nutrients (like nitrogen and phosphorus) from the surrounding water column through the surface of its fronds (leaf-like structures).

Answer:

the water column through the surface of its fronds.