This picture shows the skeleton of an animal. what best describes what the living animal had?
a. a backbone
b. radial symmetry
c. bilateral symmetry
d. asymmetry

The cluster of developing cells from conception until birth is called an

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

Adding more tributaries to a local river basin can have what effect?