Actually, seaweed is not kelp. Seaweed includes marine algae, including kelp, laver and laver, so we can say that kelp is seaweed in our daily life, but we can't say that seaweed is kelp, because seaweed contains many kinds of plants, so seaweed is not kelp.

seaweed

Each algae has its fixed tidal level, which is mainly related to the type and content ratio of pigments. Different pigments need different wavelengths of light, and the distribution of algae is also affected with the change of light intensity and light quality. Generally, in dark places or deep seas, phycoerythrin and phycocyanin can absorb blue light and green light more effectively than chlorophyll, so they are only green algae containing chlorophyll and carotene.

Although algae have no flowers, fruits, seeds and other structures to reproduce, they have various reproduction methods to adapt to the environment. In asexual reproduction, some cells can be directly divided into two parts, such as Spirogyra, which can be divided into several segments, and each segment will grow into an independent individual; Some algae can produce many flagella spores, which can swim freely, and each spore grows into a new individual when it matures.

Refer to the above content: Baidu Encyclopedia-Seaweed