Your answer for this question is paper which Is A
Answer:
oxygen because
Explanation:
because u can survive 3 days with out it and if u did not have oxygen u would suffocate
Answer:
Egg white and amino acid solution.
Explanation:
Egg white and amino acid solution are the two foods that are used for building of body parts because they have proteins in them that is responsible for the building of muscles of in human body. There are two components of egg i.e. white and yellow part. White is the proteinic part whereas yellow parts having fats and other nutrients. Amino acid solution has amino acids which is considered as the building block from which protein is made.
B. It allows some molecules to enter the cell and blocks entry to others.
Answer:
Helium and carbon dioxide
