I need to know answers to all three please and fast 18. If you were conducting an experiment, you would change only one thing,
A. to support your hypothesis.
C. to know exactly what caused the results.
B.
because there is only one constant in an
D.
experiment.
to simplify the experiment so results are more
understandable.
_19. A hypothesis is
A.
a proven statement.
C. a definite answer to a given problem.
B. a concluding statement.
D. a testable possible explanation of an observation.
20. A controlled experiment
A. introduces bias.
C. tests several variables at once.
B.
tests only one variable and is free of bias.
D.
changes no variables.

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein

Be prepared.experiment breaking point of rubber bands measured in certain amount of temperature communication

that's all i luck!