The oxygen revolution changed earth’s environment dramatically. which of the following adaptations took advantage of the presence of free oxygen in the oceans and atmosphere? select one of the options below as your answer. a. the evolution of cellular respiration, which used oxygen to harvest energy from organic molecules. b. the evolution of chloroplasts. c. the persistence of some animal groups in anaerobic habitats.

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Name the part of the the brain labeled "e".

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