Peristalsis in the alimentary canal is caused by the: a. contraction of muscle layers b. action of digestive enzymes c. stretching of the mucosa d. closing of the epiglottis

Which statement best explains how cellular respiration maintain homeostasis in animals? it maintains body temperature by absorbing energy. it breaks glucose into energy required by the organism. it speeds up metabolism by making oxygen. it produces energy from hormones present in the organism.

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?