Need help ASAP

1.) List a few reasons why a beaver is an example of a keystone species.

2.) In architecture, a keystone is the
stone at the center of an arch that holds the arch together. How does this
definition relate to a keystone species?

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

50 points! which of the following is an inference? a burning candle is extinguished when it is covered with a jar. the candle burns longer than expected in a jar that has a plant in it. a plant lives longer than expected in a jar that has a burning candle. there is more oxygen in the jar because there is a plant in it.

Blank is a rock with a find dark texture that makes up the oceanic crust