Why do walls of alveoli need to be made of simple squamous epithelial cells?

Which of the four major uses is predicted to change the least by 2020?

What protects the lining of the stomach from acidic gastric juices?

Put the following processes of protein synthesis in the correct order: - dna strands unwind and separate - mrna copies dna according to complimentary base pairing - trna's anticodons bring amino acids to the corresponding mrna codons - amino acids bind to each other making a protein - mrna leaves the nucleus - a stop codon is reached, the newly formed protein is released to go do its job for the cell