Medidas preventicas para conservar la salud aplicando la ciencia quimica

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

What three things determine the shape and size of a puddle when water is poured out onto a surface

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?