what is the varity of species is an ecosystem

A fluid must be liquid and not any other state of matter. true or false?

Is the force of gravity stronger on a piece of paper when it is crumpled? is the force of gravity stronger on a piece of iron than it is on a piece of wood, if they both have the same mass?

A high speed moving train has a momentum of 10,000,000 kilograms-meters per second. it later slows down to one half of its original velocity. what is its new momentum?

Remove the positive charge by dragging it back to the box at the bottom, and drag a negative charge (blue) toward the middle of the screen. Determine how the electric field is different from that of the positive charge.

When a rock becomes metamorphic, does it look the same as it did originally? Explain.

At the negative terminal of the battery the electron has electric potential energy. What happens to this energy as the electron jumps from the negative to the positive terminal?

A projectile is shot horizontally (x direction) from the edge of a vertical cliff 100 m above level ground. Its initial speed is 75 m/s. Neglecting air resistance.

9. What is the uncertainty of the measurement of a voltage measurement on the oscilloscope when the vertical scale is set to 2V / division, given that it uses an 8-bit D/A converter?

A 7 kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat's gravitational potential energy relative to the floor?

What two factors determine the speed of sound