How many polynucleotide chains does a DNA molecule have

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

Fredrick griffith made a scientific discovery in 1928