Cytosine<span> can form three </span>hydrogen bonds<span> with guanine.</span>
<span>In general, most dna viruses multiply in the host cell's NUCLEUS, while most rna viruses multiply in the host cell's CYTOPLASM. </span>
3) decrease
Without the green house effect, earth would be like a solid ball of ice and rock.
Life as we know it wouldn't exist without greenhouse gases.
The temperature would drop below 0° Fahrenheit!
