Lichens, represented by this symbiotic relationship, are responsible for or the establishment of a new site for plant growth.
A. primary succession
B. secondary succession
C. trophic metamorphosis
D. ecological infiltration

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Ahis which describe the horizons in a soil profile? check all that apply. horizon a is mineral deficient. bedrock lies below the soil layers. te horizon o forms from organic material, horizon b undergoes the least amount of change. horizon c is least affected by the soil formation process.

Cardueline finches can be found in what areas of the world?