Altruism is helping someone without concern for your own gain because you expect a reward O because you are afraid you'll be sued if you don't help O because other people are watching​

It maybe because uranus is made of gas but uranus has a solid core in the middle

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.