Which of these are oxidation-reduction reactions? I. 3H2 + N2 → 2NH3 II. Cu2O + C → 2Cu + CO III. Fe2O3 + 3CO → 2Fe + CO2 IV. 2K + Br2 → 2KBr

Which of these substances has/have the lowest boiling point?

Which of these occur(s) during oxidation? I. Gaining electrons II. Losing hydrogen III. Losing oxygen

Which of these is correctly associated with the cathode? I. Electrode with a positive charge II. Electrode at which a substance loses electrons III. Electrode at which reduction occurs

During oxidation-reduction reactions, the substance that loses electrons is _____and the substance that gains electrons is _____.

Which of these substances has/have the lowest boiling point?

Which of these substances would have the weakest cohesive forces in combination with extremely high molecular mobility?

Male amphibians, including frogs and toads, have been plagued by feminization, deformity, behavioral abnormalities and sterility.  Biologists from the University of Florida investigated whether reproductive problems among populations of cane toads (Bufo marinus) are caused by poisons from chemicals associated with agriculture. The biologists collected local adult cane toads from more than 20 different locations. Toads were collected from areas close to agriculture, both large-scale and small-scale farms, as well as from suburbs that are nonagricultural areas. Based on this study, what is/are the test group(s)? 

Which of the following is the correct sequence through the endomembrane system for material that is destined to be secreted from the cell?

Salmon live in both fresh water and salt water during their lives. They are born in in fresh water but migrate out to marine waters for most of their life. Eventually, they return to the place they were born in fresh water to spawn. Changing between fresh water and salt water affects the balance of water in their body. Salmon have an internal control system called osmoregulation that restores the balance by negative feedback. This is an example of which characteristic of life?