The convection that causes earth's magnetic field happens in earth's

Late at night some traffic signals change patterns and become ?

The chart below matches messenger rna codons with amino acids. a dna strand has the sequence of bases, aat. according to the chart, the corresponding messenger rna codes for which amino acid?

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?