*Question*
You are presented with the question "What converts electrical energy to sound?" and the following answer choices:  - ears  - organ  - radios  - pencils  - engines  - waves  - Gunshots  - antennae  Now knowing that aradio converts electrical energy into vibrations and all sounds are vibrations, choose the best answer.
**Answer**
radios

*Question*
You are presented with the question "What is public transportation used to transport large amounts of?" and the following answer choices:  - animals  - energy  - people  - air  - boxes  - organisms  - athletes  - coal  Now knowing that transportation technology is used for moving people and public transportation is a great way to move massive amounts of people from place to place, choose the best answer.
**Answer**
people

*Question*
You are presented with the question " have sense organs to smell and taste chemicals" and the following answer choices:  - goats  - humans  - Birds  - worms  - frogs  - fish  - nose  - slugs  Now knowing that amphibians have sense organs to smell and taste chemicals and all frogs are amphibians, choose the best answer.
**Answer**
frogs

*Question*
You are presented with the question "what does biodiversity increase the productivity and stability of?" and the following answer choices:  - density  - the looseness of soil  - water vapor  - the environment  - h2o  - swamp vegetation  - biological diversity  - organisms and their habitat  Now knowing that biodiversity increases the productivity and stability of ecosystems and an ecosystem includes the organisms and their habitat, choose the best answer.
**Answer**
