By signing the kyoto protocol, a country commits to decrease its greenhouse gas emissions. which ecological issue does this protocol address?
a) over population
b) water scarcity
c) loss of biodiversity
d) climate change

The largest internal organ in the frog is the

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone, pumice, and gneiss.

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic