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Identify the haploid and diploid phases of a gymnosperm life-cycle.

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Why are common names a problem for scientist?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million