Aniche is part of an organism's habitat. true or false?

True

An ecological niche can be defined as the functional role an organism performs in the ecosystem in order to sustain it's life. It includes how an organism obtain it's food, which type of food it consumes, what type of habitat is used by the organism, interaction of the organism with the other organism of the ecosystem.

A niche is a part of an organism habitat as the habitat is responsible for the functional role performed by the organism. For example, how an organism compete with other organism of the same or different species to obtain the habitat.  

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:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.