What is the most penetrating kind of radiation product that can be shielded with aluminum foil? A: alpha particles
B: beta particles
C: gamma rays
D: high-energy photons

Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds