All of the following are epigenetic mechanisms, EXCEPT . changing gene expression by changing the nucleotide sequence through mutation changing gene expression by adding and removing methyl groups to DNA changing gene expression by the use of small noncoding RNAs changing gene expression by adding and removing chemical groups to histone proteins changing gene expression by the use of long noncoding RNAs

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

This rapid change in species that rarely leaves behind fossil evidence is referred to as

24. how are vaccines used to keep people healthy?