18. Some factors have density-independent effects on changes in population size. For example, freezing weather, tornadoes, floods and fires can drastically reduce population size, independent of initial population density. These types of density-independent effects are not included in the exponential or the logistic population growth models, so these models do not accurately predict changes in population size for a population that is strongly influenced by density-independent effects. Give an example to illustrate this.

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

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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.