Please help! No links What is the best definition of an allele?

A: the number of chromosomes present in an organism’s cells

B: the type of molecule that forms chromosomes and genes

C: an alternative version of a gene

D: the physical appearance of an organism has as a result of a specific gene

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

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?