Question 9 (1 point) [05.04]
Which best describes why water has relatively high surface tension? (1 point)
a
Water molecules have a bent shape, which prevents them from packing together
Ob
Water molecules are attracted to each other due to hydrogen bonding:
с
Water molecules cannot bond with any other compounds.
Water molecules contain oxygen atoms, which cannot break into smaller atoms.
Question 10 (1 point)
(05.04
scientist is studying

Increase in atmospheric oxygen by the photosynthetic organism to the biosphere evolved more complex forms of life. Many different plants, animals consuming plants, bacteria decomposing dead plants and animals evolved.These forms a food web in the biosphere. The remains of dead plants and animals release nutrients to the soil and ocean which are reabsorbed by the other growing plants.This food exchange  and energy exchange make the biosphere a self supporting and self regulating system .