Erosion occurs when

1. a chemical change happens in rock formation

2. precipitation falls on a rock formation

3. solid particles are deposited elsewhere over time

4. liquid enters the water cycle

how the endocrine system and nervous systems become involved when a student feels stress--such as that associated with an upcoming exam. Be detailed and cite sources in this weeks posting.

The pH scale measures whether solutions are acidic, basic, or neutral. The pH needed by living cells is very specific, and can vary only slightly. because all living things are made up of cells that are mostly water, the pH of cells is close to A) 7.

Body structure of multicellular organisms

A strand of DNA in a skin cell contains the bases: A-T-G-C-C-A-T-C-G-G-T-A After the cell is exposed to ultraviolet light, the strand contains the bases: A-T-G-G-C-C-A-T-C-G-G-T-A Which statement describes the result of this exposure?

Two strands of DNA are joined to each other or held together by

Some forests develop after farmland is abandoned. Grasses may be overtaken by pine trees which are eventually replaced by hardwood trees. During this process, the soil also changes. Which change during this process is a form of chemical weathering?

Which ranks the solutions from the strongest to weakest acid

An astronomer sees bands of different colors from objects in space using this tool

Euglena can be classified as both: A) Autotroph and a parasite B) a decomposer and a heterotroph C) a producer and a parasite D) an autotroph and a heterotroph

What area in the brain sets the respiratory rhythm?