What is animal that has blue blood​

Reason i shouldnt turn back if i'm lost in the wilderness need fast

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal