Identify the scientists from their contributions. a) Oxygen is formed in plants as a result of photosynthesis. y
b) Source of oxygen evolved during photosynthesis is water.

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?

Which of these definitions have been paired with the correct type of cell?

As soon as i live in alabama and i have question to me with a report. or rather a statement. the statement i need with: discuss the influence of cost and availability on your states (alabama) statistics. i really need to complete this. so anything will ! 20 points are up for grabs to the most !