Which structure in the heart controls the flow of blood and prevents it from flowing in the wrong direction?
veins
Literies
valves
chambers

What happened to rosalind franklin in 1956?

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab