A source of laser light sends rays ab and ac toward two opposite walls of a hall. The light rays strike the walls at points b and c, as shown below:.

Berikan satu kepentingan terhadap komposisi udara di atmosfera bumi

Tortoise shells and snail shells are similar in function: they protect the organism from predators. based on a comparison of the organisms in the images, what can you conclude? 1. tortoises and snails have homologous organs, and they’re evolutionarily related. 2. tortoises and snails have homologous organs, and they belong to same species. 3. tortoises and snails have analogous organs, and they belong to the same species. 4. tortoises and snails have analogous organs, and they don’t belong to the same species. 5. tortoises and snails have analogous organs, and they aren’t evolutionarily related.

How do you work out 21.3-8= show your working. plz