The percentage of oxygen in the air is 21.0%, but the percentage in air exhaled while breathing is A. 21.0%
B. 18.0%
C. 16.0%
D. 14.0%
E. none of the above

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

Put the following processes of protein synthesis in the correct order: - dna strands unwind and separate - mrna copies dna according to complimentary base pairing - trna's anticodons bring amino acids to the corresponding mrna codons - amino acids bind to each other making a protein - mrna leaves the nucleus - a stop codon is reached, the newly formed protein is released to go do its job for the cell

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming