Tand b cells change after contact with the pathogen in a(n) immune response

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

What is the difference between an igneous, sedimentary and metamorphic rock

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?