|will give brainliest if correct|
lina is late to science class and misses the very beginning of notes for the day. these are the notes that lina did copy down:

–found within galaxies
–have at least 1 star at the center
–have objects orbiting the star
–planets
–moons
–asteroids, comets, meteoroids, dwarf planets

lina later copied the title of the notes from a friend. what title did lina most likely copy?
the universe
galaxies
solar systems
the milky way

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience.b. report the adverse drug experience to the irb only if there are several other occurrences.c. report the adverse drug experience as part of the continuing review report.d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?