What is the correct sequence of organisms if a community is going through secondary succession? a. grasses establish themselves in the community b. shrubs establish themselves in the community c. soil formation occurs d. trees establish themselves in the community c - a - b - d a - c - b a - b - d d - c - a - b?

The correct sequence is c - a - b – d.

Soil formation occurs, grasses establish themselves in the community, shrubs establish themselves in the community and trees establish themselves in the community.

then that particular organisms become extinct.

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: