Students at a bonfire noticed that a large amount of gas and ash were produced as they watched the logs of wood burn.

Which statement best explains the type of change that occurred as the logs of wood burned?

A.)

A physical change occurred because the atoms in the wood changed from a solid state to a gaseous state as the atoms in the wood burned.

B.)

A chemical change occurred because the atoms in the wood reacted with oxygen and rearranged to form new combinations of atoms and molecules.

C.)

A physical change occurred because the ash and gas produced can easily be turned back into wood.

D.)

A chemical change occurred because a chemical reaction occurs any time heat is added to a substance.

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

Contrast how pollination is different among gymnosperms and angiosperms.

7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?