To keep a species from getting genetic diseases and inbreeding over time, new
variations in genes can be randomly introduced byand
A.)Genotypes and phenotypes

B.)Genetic drift and meiosis

C.)Natural selection and directional selection

D.)Crossing over and mutation

Identify which gland in the endocrine system is involved in each dysfunction and explain the effect of hormonal imbalance that was observed. 1.dwarfism 2.gigantism 3.goiter

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.

Darwin’s hypothesis about how life changes over time is now called?