Etymological meaning of demography

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture

Which one is an advantage of external fertilization a. the offspring are genetically identical to the parents b. more eggs can be fertilzed at one time c. more sperm can be released at one time d. more protection is available for developing plz