1. what element has 81 protons in the nuclei of its atoms?
a. platinum
b. lead
c. thallium
d. uranium

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

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.