Javier's little sister tends to bother him while he is doing homework. Javier wants to figure out which toy will keep his sister occupied the longest, so he will not be bothered. Javier decides to conduct an experiment where each day at 6 PM for a week, he gives his sister a different toy and on one of the days, he gives her no toys to play with. Javier measures the amount of time his sister spends playing with each toy before she comes to bother him. Which of the following is the independent variable in this example? Amount of time spent playing with the toy

Day of the week

Homework assignment being completed

Time of day

or Toy being offered

Atown located beside a river derives a large percentage of its revenues each year from the local logging industry. however, heavy traffic to and from the logging sites has increased pollution and contributed to soil erosion. this has also resulted in the loss of native bird species in the logged forests. which of the following is the most sustainable solution to this problem? protecting certain forested areas to allow the birds to recover relocating the equipment and vehicles to new forests for logging relocating the birds to new forests away from the town introducing new bird species to replace the species that have been lost reducing the number of trucks traveling through the forest by 10 percent