How many different nucleic acids are known to exist

Draw the structure of dna nucleotide with adenine as nitrogenous base

Match each description of an object’s motion with the position-time graph that represents it. not moving moving with constant speed speeding up slowing down

What is a population? a. all the members of the same species living in the same ecosystem at the same time b. the number of a species living in the same ecosystem over a period of time c. the total number of organisms living in an ecosystem at a point in time d. all the members of a food web in the same ecosystem