What are proteins that are found on the surface of some red blood cells. genes
alleles
antigens
immunoglobins

Describe two recent or ongoing space missions.

This is the process of making a prediction based on the results of prior observations of similar events.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes