Goats were originally brought to the Galapagos Islands by sailors in the late 1800’s, and over the next century, they ate much of the vegetation on several islands, damaging many native plant and animal ecosystems. In 1997, Project Isabella was launched, in which goat hunters used helicopters and sniper rifles to diminish local goat populations. In less than a year, goat hunters realized that some goats were terrified of loud noises and ran away from the approaching helicopter noise, while others are less afraid and continued eating, making them easier to find and kill. Nowadays, almost all of the local goats hide in caves when they hear the sound of a helicopter approaching.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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

2. cheryl hears a new song on the radio every day during the week on her commute to work. surprisingly, when the song comes on at a party on saturday night, she knows most of the words without trying. describe the three ways that we use cognition to learn without reinforcement. which type of cognitive learning without reinforcement best explains how cheryl knew the song lyrics? explain your answer.