Ascientist is designing an investigation to study the impact of uv radiation present in high-altitude habitats on the population of mountain yellow-legged frog. what type population is most likely to be a control group for the study?

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron