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.

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens