If aliens are creatures from far away from earth does that mean that if i go to mars and came back IM a alien? and if you say i originated from earth so if matter from earth got burst into space and that matter got eaten by a alien and the matter is a part of the matter does that mean that the alien is not a alien?

What function does a limb serve in each animal how are the limb bones of the four animal similar based on the similarities what can be inferred about the evolution of the poor animals

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

Which of the following is not associated with invasive species?