Use your understanding of gravity to explain why an extraterrestrial from a planet with a mass four times our earth would be an incredible UFC (ultimate fighting, but you can think restling or any other strength based sport) fighter.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.