Which two of the three elements have SIMILAR CHEMICAL PROPERTIES (valence electrons)? 1. Li - Na - Mg
2. F - Br - O
3. P - As - Se
4. Ra - Ba - Cs

The process by which natural forces move weathered rock and soil brim one place to another is called

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.