Scientific knowledge may change when it is reexamined. For example, scientists in the 1930s proposed changing the way in which organisms were classified. They expanded the number of kingdoms from three to four. The scientists placed the bacteria, which had previously been classified with other single-celled organisms, into this fourth kingdom. What was the main reason for this change in the classification system?

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands

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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.