Which pathogen must attach itself to another living organism in order to survive, grow, and reproduce?

Kailyn was recently in a car accident. ever since, she has been experiencing intrusive thoughts and flashbacks and is having difficulty concentrating in school. into what dsm-5 category does kailyn’s behavior fit? what specific diagnosis might you give her? does everyone who is in a car accident develop the same symptoms as kailyn? why or why not? discuss one factor that makes a person more susceptible to these issues.

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses.b) the infected individuals happened to be infected with all three virus types.c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly.d) the human was likely infected with various bacterial strains that contained all three rna viruses.