Andrew believes that the rapid spread of malignant tumors throughout his body resulted from the stress of losing his wife during the past year. it would also make most sense for andrew to attribute the speedy progression of his cancer to his:

We can attribute the speedy spread of tumors on his body through his mental health and perception. One of the causes for cancer development apart from lifestyle and food would be our mental disposition and how we perceive our life. Because Andrew was convinced of his stress, he made this is reason and his perception was affected resulting to poor mental disposition causing the cancer to spread faster.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.