Why can't sea animals breath under water

What is the difference in the phisical activity requirements for achieving healt benefits and performance?

Brian is admitted to the hospital after a motor vehicle crash. during his stay at the hospital, physical therapists him with his recovery. this is care?

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes.b) no; antibiotics do not kill viruses because viruses do not have dna or rna.c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.