Which of these statements is true about heating up air in the lower atmosphere?
a. it occurs mainly through radiant energy.
b. it occurs through convection from earth.
c. it happens to a different extent over land and water.
d. it takes place through conduction between the sun and air.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla