Question

1. describe what do pioneer species provide or make possible in an ecosystem? select all correct answers. a. organic matter b. rocks c. seeds d. shade e. soil

Explanation:

Pioneer species, like lichens in primary succession, break down rocks (through processes like lichen - rock interaction) to start soil formation. As they die, they contribute organic matter to the developing soil. Some pioneer species (e.g., certain grasses) can also provide shade as they grow. Rocks are the starting material in primary succession (not provided by pioneer species in the sense of creating from nothing, but pioneer species act on them). Seeds are not a typical main contribution of pioneer species in the context of what they "provide or make possible" for the ecosystem's development in the early stages compared to the other relevant factors.

Answer:

A. organic matter, D. shade, E. soil