i don’t know what 2+1 is. someone help me out

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

According to this food web which of the following would be considered primary consumers

Select all that apply genes are specific nucleotide sequences occur in numbers that are the same as the number of chromosomes are located in a specific place on a chromosome determine the traits of an organism are units of rna