46. Why is energy lost as you go up the food pyramid?

a. Not all of the producers are eaten by first order consumers
b. Energy is used up in the consumer's activities
c. Some energy is lost in the secretion of waste
d. All of the above

47. Which of the following set of organisms shows the correct example of a relationship known as antibiosis, a type of amensalism, where one organism is destroyed while the other is unaffected?

a. Barnacle sticking on the shell of an oyster
b. Fern plant growing on a trunk of a tree
C. Lion hunting deer for food
d. A penicillin killing bacteria

48. Setting up an aquarium that represents a mini ecosystem has to have which set of requirements?

a. Communities of different species of organisms, water, sand, soil, and sunlight b. Populations of fish, snails, and plants only
C. Water, sand, soil, and light only
d. Fish and water

abcd lang sagot nyo;)​