Which of the following substances "coat" the bacteria to aid in phagocytosis?

An XX pair of chromosomes means that the fetus will be a:

A) baby boy B) baby girl C) brown-haired child D) blue-eyed child

Studies conducted in ideal conditions such as laboratory settings, and designed to determine a causal relationship between an intervention and outcome among a homogenous target population constitutes:

a. effectiveness research b. elastic research c. effusive research d. efficacy research