2. what are some important advances or discoveries someone in that field has made astronomy-radio in the last 100 years.3. how does impact the daily lives of people?

Ihave made a dive then stayed on the surface for a while. after this surface interval my pressure group is k. what is the maximum amount of bottom time available when doing a repetitive to 17/56 feet

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

Physical needs include: a. the need for sleep b. the need to feel safe c. the need to feel secure d. all of the above