An ecosystem is a geographical

where plants, animals, the landscape and the climate all interact.

where plants, animals, the landscape and the climate are all independent of each other.

where only plants live.

independent of all other areas.

If a 60-g object has a volume of 30 cm3, what is its density? 2 g/cm3 0.5 cm3/g 1800 g * cm3 none of the above

How does litmus paper indicate an acid?

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other