The maintenance of a self-sustaining ecosystem requires a A. soil that is acidic
B. constant temperature
C. greater numberof herbivores than producers
D. cycling of materials between organisms and their environment

Yeast cells reproduce quickly by budding. this is a form of reproduction so all the yeast cells a) sexual; vary b) asexual; vary c) asexual; are identical d) sexual; differ from the parents submit hint structures and functions of cells cellular reproduction

People with one sickle cell allele are not likely to get malaria. what is this an example of?

Which soil would most likely be found in the arctic? andisols gelisols histosols spodosols