Trees are among the largest and oldest living things on Earth. Like all life on Earth, the majority of a tree's biomass is carbon based. What is the source of this carbon?
A) Crushed rock and water
B) Fertilizers
C) The organic layer of the soil
D) Air
E) Water
D
You might also like to view...
Water has fewer hydrogen atoms than lemon juice and a pH of around 7. Predict what will happen to the pH level of water when lemon juice is added.
A. The pH will become higher. B. The pH will become lower. C. The pH will remain the same. D. There is not enough information to decide.
The underlying problem with cystic fibrosis is
A. the inability to transport chloride ions. B. mutations in the hemoglobin molecule. C. defective ganglioside molecules. D. the inability to metabolize certain amino acids. E. abnormal fat deposits around the heart.
What statement is NOT true about the human nervous system?
A. The autonomic nervous system controls glands and smooth muscles of the viscera. B. The central nervous system consists of the brain and spinal cord. C. The somatic nervous system controls skeletal muscles. D. The somatic nervous system is part of the peripheral nervous system. E. The somatic nervous system is further divided into the sympathetic and parasympathetic divisions.
West Nile virus has the following characteristics, except
A. it causes a hemorrhagic fever. B. it causes a severe encephalitis in less than 1% of infected persons. C. it is an arbovirus. D. it is transmitted by a mosquito vector. E. it is typically a flu-like illness.