The graph below shows the energy associated with a chemical reaction. The activation energy decreases once a certain type of molecule is added. What type of molecule causes the activation energy to decrease as shown in the graph? O Lipid

O protein

O nucleus acid

O carbohydrate

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos

The bacteria in the human gut feeds on the food we eat and us break it down for better digestion. what does this exemplify? (a) predator-prey cycle (b) parasitism (c) mutualism (d) a disrupted food chain