Much confusion lingering this question!

a scientist observing a group of spider monkeys noticed that the adult females often spend time picking leaves off of tree branches. the scientist hypothesizes that this behavior is caused by boredom. is the scientist’s hypothesis valid?
no, humans are the only organisms that experience boredom.
yes, boredom is a likely explanation for the spider monkeys’ behavior.
no, emotions of non-human organisms cannot be tested.
yes, the hypothesis could be tested through a controlled experiment.

Athermometer is placed in water in order to measure the water’s temperature. what would cause the liquid in the thermometer to rise?

Turtle hatchling survivorship rate is low in many turtle species due to predation. amanda researched the predatory rate on a species of turtle eggs in the red river. the eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. research suggests that predators use the female's cloaca scent to locate the eggs. the eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. the nests were monitored by cameras and manually on foot and data on nest predation were recorded. a. based on the experimental design, what is the dependent variable? b. based on the experimental design, what is the independent variable? c. based on the experimental design, what is the control?

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?