Pair up with why long hairy outgrowths slow down algae sinking. Let one hypothesize, while the other analyzes them.

The hairs are like a brake, slowing down the sinking and increasing the buoyancy of the body. The presence of hairs is a device in algae to increase buoyancy. But this increases the friction against the water.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.