In the vacuum of space there is no molecules. Sound waves get to your ears by bouncing off of molecules in the air. No molecules in space's vacuum means sound waves have nothing to bounce of off so they can not reach our ears meaning we hear no sound.
Answer: Photosynthesis and cellular respiration are complementary biochemical reactions.
Explanation:
Photosynthesis requires the products of respiration , while respiration requires the products of photosynthesis.
Answer: nervous system
Explanation:
The nerves send impulses either from the brain or spinal chord for the body organs to coordinate
Below are the choices, the answer is no. 3:
1) The virus was descended from a common ancestor of bird, pig, and human flu viruses.
2) The infected individuals happened to be infected with all three virus types.
3)Related viruses can undergo genetic recombination if the RNA genomes mix andmatch during viral assembly.
4)The human was likely infected with various bacterial strains that contained all three<span>RNA viruses.</span>
