[Ar] 4s1 is the correct answer
Mutualism
Explanation: a relationship between two species of organisms in which both benefit from the association.
Answer: A
Explanation: Diffusion is important to cells because it allows them to gain the useful substances they require to obtain energy and grow, and lets them get rid of waste products. This table shows examples of substances required by cell and associated waste products.
If you have one sickle cell gene, you have sickle cell trait and you will not develop the sickle cell disease. If you inherit two sickle cell genes, you have sickle cell anemia.
Compressed is the first blank and older is the second one