A marine biologists is a professional who studies underwater life. Marine biologists mainly concern themselves with the happenings in water. Does your child want to be a marine biologist when they grow up? Introduce them to the team of marine biologists in this worksheet who have spent three days planting new coral to keep the coral reef healthy. The team has already spent two days planting, and are looking to figure out how much of each specie they need to plant on the third day to reach their goal. Help your child figure out the answer and check it on the printout.