All living organisms are composed of

at least 100 cells.

one or more cells.

only one cell.

at least three cells.

Which statement is true for a cooling curve?

Which is an example of an energy transformation? (A) a soccer ball sitting in a field. (B) a person waiting at a crosswalk. (C) an unlit candle. (D) a boulder falling off a tall cliff.

Every bronsted-lowry acid is also a lewis acid True or False

2H2+o2->2H2o What changes occur in the reaction indicated by the equation? Check all that apply. The hydrogen nucleus loses protons. The oxygen nucleus gains protons.

Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. Is it likely that these rocks were present when Earth was first formed? a. No, rock material is constantly recycled on Earth as rock is melted into magma. b.

How does light pollution affect plants and animals? Light pollution harms plants and animals because they confuse it with

In what ways are polyatomic ions like simple ions

How does oxygen obey the octet rule when reacting to form compounds? A) It gains electrons. B) It gives up electrons. C) It does not change its number of electrons. D) Oxygen does not obey the octet rule.

Which equation obeys the law of conservation of mass? A. 2Fe+3O2 - -> 2Fe2O3 B. 4Fe+O2--> 2Fe2O3 C. Fe+O2--> Fe2O2 D. 4Fe+3O2--> 2Fe2O3

Why do airbags fill evenly with gases?