Which describes the interaction? Two abiotic factors are interacting.

Two biotic factors are interacting.

The tree is abiotic and is interacting with a biotic factor.

The tree is biotic and is interacting with an abiotic factor.

The blank theory suggests that the sun, planets, and other celestial bodies of the solar system came from a cloud of dust and gas? a.) condensationb.) steady state c.) big bang d.) nebular

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

One disadvantage that darwin faces today is w. enemy attacks x. natural disasters y. lack of land bridge z. high population density