13. Synovial joints are considered to be: - None of these
- Slightly moveable
- Freely moveable
- Immovable

Ais the

Ben should classify a mango tree as an autotroph because it makes its own food with photosynthesis. he should classify algae as a heterotroph because it relies on other living things to get food.

Movement of earth’s crust creates low areas that fill with water. also streams flow into shallow areas.