Populations increase as individuals are born. Populations decrease as individuals die The number of births compared to the number of deaths helps to determine if a population is increasing or decreasing.

Checking understanding Factors Increase population size Decrease population size -------------------------------------- ------------------------------------

How natural equilibrium is maintained in an ecosystem How natural equilibrium is maintained in an ecosystem? Which factors increase / decrease population size.

Objective (s)/ I can: Objective (s)/ I can: Explain how biotic and abiotic resources can be limiting factors in an ecosystem.

Discuss the moral and scientific aspects of this picture and connect it to the objective of the lesson.

Each group will get a picture, Activity 1: Analyzing visuals and predicting consequences---Cause/Effect. CCC   Each group will get a picture, Analyze it by examining the effecting and affected factors, and then Swap the pictures between the groups.

Limiting factors 3 1 2 5 4 6

2 3 4 5 6

Limiting factor Case # Limiting factor Type /nature Effect on the population

Limiting factor Case # Limiting factor Type /nature Affect on the population 1-plant growing in a rock whole Rock Abiotic Limits the growth of the plant population. 2- withered flowers in snow 3- Lion hunting a zebra 4- A disease affecting a leaf 5-people facing a flood 6- using insecticides for plants

Elaborate: Find solutions to decrease the mosquito population in a large city with many people. Solve p:89 “Engineer it”

Objective (s)/ I can: Students analyze graphical data to develop arguments for why a population increased or decreased.

Recall The amount of resources in an area influences the size of a population. A population may grow or shrink, depending on whether important resources are added to or lost from the environment.