Poetry is a powerful means of expression due to its generosity.
Answer:
Cause: Wisps of gas and drifts of dust collect
Effect: The cloud's gravitation grows and pulls itself into a massive ball of material
B. The mimosa is a tree that blooms in early summer.
Correct. That blooms in early summer is an adjective clause that modifies the noun tree.
The answer is But to-morrow I die, and to-day I would unburthen my soul.