The fleas benefit the dog true or false?

false

Explanation:

Only the fleas benefit from being on the dog. Therefore, it is a parasitic relationship because one organism in the relationship is harming the other in the relationship for its own benefit. Also that animal (the fleas) would have to find a new home if its host dies, as it cannot live without it. :)

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.