Yes. the nucleotides are A, T, G, and C. A and T pair up and G and C pair up. For instance, if your known strand is AGTCAG then the second strand would have to be TCAGTC. Also, if there is a U in the strand, it takes the place of T. so the original strand would be AGTCAG and the unknown would have to be UCAGUC.
An example for life for an animal and plant are that the both require foods to live. Animals hunt there own food but plants make there own due to photosynthesis. But they are similar because they both require food to continue living. There are many more characteristics but that is just one common one.
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Decomposers break down the remains of dead plants and animals and take the nutrients and energy and give it back to the earth when they die.
Space is filled with nothing.
Space is the absence of matter.
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Theories basic to all of the life sciences include the cell theory because all living things are made up of cells.