Could you possibly tell me what exactly you need help with? As my computer already has viruses, I am surely not going to click on any of those. Sorry!
Natural acids because chemicals erode rocks in chemical weathering
B! The strongest characteristics will survive when the weak ones won't
The disadvantage of having imformation at your fingertips is that not all of information could be true but only mere ideas or theories and that having alot of information can be overwhelming to the point where you can process so much information you might forget about the important things you come across for some propaganda trying to get your attention
I am not sure but here is a link to help you :)
https://www.ncbi.nlm.nih.gov/pubmed/22322095
