Which of the following statements regarding quorum sensing is true? (a) gene expression is altered when the population of a specific microorganism is low. (b) there is no relationship between quorum sensing and gene expression. (c) quorum sensing is a phenomenon very few organisms are capable of accomplishing. (d) gene expression is altered when the population of a specific microorganism is high.

Juan's investment portfolio was valued at $125,640 at the beginning of the year. during the year, juan received $603 in interest income and $298 in dividend income. juan also sold shares of stock and realized $1,459 in capital gains. juan's portfolio is valued at $142,608 at the end of the year. all income and realized gains were reinvested. no funds were contributed or withdrawn during the year. what is the amount of income juan must declare this year for income tax purposes?