Which of the following statements is NOT true of archaebacteria? A. many species are extinct
B. Archaebacteria differ from eubacteria with respect to cell wall, ribosomes, and antibiotic sensitivity.
C. These bacteria live in extreme environments.
D. Many archaebacteria cause disease in humans.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg