In the crystal matrix of ordinary salt, the sodium and chlorine are held together by: A. peptide bonds.
B. covalent bonds.
C. ionic bonds.
D. hydrogen bonds.
E. nonpolar bonds.

Which events are likely to be catastrophic to an ecosystem? select the three correct answers. a-hurricane. b-steady population growth. c-seasonal flooding. d-introducing of an aggressive invasive species. e-tsunami.

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

What is the term for the two sets of chromatids formed in the parent cell a. haploid b. diploid c. gamete d. tetrad