Ayellow tulip and a red tulip are 1. different species 2. different breeds of the same genus 3. organisms in two different kingdoms 4. variations of the same species

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

What is a group of organisms that are closely related and share similar characteristics

What is the most abundant vertebrate on earth?