When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? -2 -1 +1 +2

Which of the following best describes the purpose of technology?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

What form of anesthetic was used for field surgery