The nitrogenous bases (A, T, C, and G) of DNA are held together by a
hydrogen bonds.
b
covalent bonds.
c
van der Waals forces.
d
ionic bonds.

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.

Each hereditary trait corresponds to

Isotopes of the same element have differ in their