In wetlands there is a type of algae that is considered an epiphyte because it will live on floating plants in the water. The algae benefits but the floating plant is not harmed nor does it benefit. This is an example of what type of relationship?

Commensalism.

Explanation:

Commensalism is a symbiotic relationship that exist between organisms in which one organisms benefit from the relationship and the other neither benefit of is harmed. From the question the algae benefits by getting accommodation and nutrients from the floating plants but the floating plants neither benefit or is harmed.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

answer; i believe the correct answer to the above question is ( friction)