BIO 202 Arizona State University -BIO 202 Exam 1 fully solved rated A+

BIO 202 Arizona State University -BIO 202 Exam 1 fully solved rated A+How long have humans been around? - correct answer 2 million years How long ago were dinosaurs wiped out? - correct answer 65 million years ago When did Charnia live? - correct answer 560 million years ago When did single-celled life first appear on Earth? - correct answer 3.5 billion years ago For how long were simple-celled organisms the most advanced form of life on Earth? - correct answer About 3 billion years How are the ages of rocks determined? - correct answer By radioactivity What might have been the spark that ignited the evolution of animals? - correct answer Bacteria living on the surface of glaciers that could endure extreme temps What was the event called that caused the Earth to freeze completely over? - correct answer Snowball Earth How long did snowball earth last? - correct answer Millions of years What helped out snowball earth? - correct answer A global surge in volcanic activity What atmospheric gas do cyanobacteria and other photosynthetic bacteria produce? - correct answer Oxygen