How are interest groups different from political parties?

Interest groups do not run for elections while political parties need to run for elections so that they could gain and achieve power.

Explanation:

As we know interest groups are groups of individuals who come together to achieve specific goals, they are usually goal-oriented entities that do not have any specific agendas. Whereas political parties are group of individuals who come together with specific party agendas.Interest groups do not run for elections while political parties need to run for elections so that they could gain and achieve power.Also, interest groups may dissolve once their goals are achieved. However, political groups tend to continue for a longer period of time even if they do not win elections.

Ba population changes in response to a change in environment

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.