An orange roughy fish is a fourth-level consumer that requires almost ten times the amount of food available from the primary producers in the ecosystem. why isn't more energy available from the primary producers?

a. primary producers are not very efficient and lose most of their energy to the environment.
b. there is too much competition from other fourth-level consumers, leaving very little available to the orange roughy.
c. only a fraction of energy is passed through each level, so there is less available to upper-level consumers.
d. the energy flow is unbalanced and tends to move toward the lower levels.

The correct answer is option C

The fraction of energy that is available to the fourth level of the ecosystem is very less because the fraction of energy is passed on through each level.

According to the law, only 90% of the energy is transferred through each tropic level and rest of the energy is lost in the form of heat.

Thus, only a fraction of energy reaches the upper tropic level starting from the producers.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.