Solve these clues to fill the grid.
- Living things like dogs and birds
- 5 Across
- An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous ___
- 6 Across
- A mammal with wings formed from its forelimbs.
- 8 Across
- Tall plant with a trunk and branches
- 9 Across
- A system formed by the interaction of a community of organisms with their physical environment
- 11 Across
- Scaly swimmer that breathes through gills
- 14 Across
- Gas in the air that we need to breathe
- 15 Across
- Clear liquid we drink that falls as rain
- 1 Down
- Any of several herbivorous leaping marsupials of Australia and New Guinea having large powerful
- 2 Down
- Study of the natural world through experiments
- 3 Down
- What we eat to get energy and grow
- 4 Down
- Long stream of water flowing to the sea
- 7 Down
- Warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
- 8 Down
- Protective covering that provides protection from the weather
- 10 Down
- The part of the earth's surface consisting of humus and disintegrated rock
- 12 Down
- Any of various tailless stout-bodied amphibians with long hind limbs for leaping
- 13 Down