Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008
The data show that decreasing O2 levels is [caused by / correlated to] increasing CO2 levels
in the atmosphere.
What will be an ideal response?
correlated to
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What is the role of the protein FtsZ?
A. It forms a ring at the site of constriction. B. It is involved in the attachment of DNA to the plasma membrane. C. It is responsible for the replication of DNA. D. It forms the new cell wall between daughter cells.
The number of electrons for the atom depicted in the figure is
a. 5. b. 7. c. 8. d. 15. e. 22.
Protection from injury, dehydration, and microbes is provided by the
a. immune system. b. skeletal system. c. integumentary system. d. endocrine system. e. lymphatic system.
Genes with promoters that are constitutively expressed and needed in all cells are called
a. universal factors. b. silencers. c. activators. d. housekeeping genes. e. enhancers.