Which of the reactions below is a decomposition? i. 2ch4 + 4o2 → 2co2 + 4h2o ii. 2mg + o2 → 2mgo iii. Bacl2 + naoh→ nacl + ba(oh)2 iv. Ca(oh)2 → cao + h2o.

Onstruct the grouped frequency table for the following data. 1, 1, 1, 1, 2, 2, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9

The graph shows the populations of two species over time. which type of symbiotic relationship does the graph represent? a. commensal b. mutualistic c. parasitic d. parent-offspring e. predator-prey

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.