Ithink the answer is c but not sure. can someone tell me their thoughts on matter?
the elderly can have impaired immune systems, making them susceptible to infections that can take longer to heal. which of the following would be most in preventing these types of illnesses in the elderly?
older people should avoid exercise so that their bodies are not exposed to stress.
older people should regularly take antibiotics to prevent development of infection.
older people should be vaccinated for common viruses like the flu virus.
older people should consume large amounts of protein to boost their immune system.

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

What could happen if two base pairs on a strand of dna or switched