What substances does lichen and moss produce that will break down rock? 1.) soil
2.) acid
3.) rust
4.) ice

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

d. planting trees

the trees take in carbon to make oxygen.

yes, because even though a theory has a  lot of evidence to support it, it is not always true

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong