In this minds-on analysis and discussion activity, students learn how the cell cycle produces genetically identical daughter cells. They analyze how DNA replication and mitosis work together to ensure that each new cell gets a complete set of chromosomes with a complete set of genes.

To understand how a single cell (the fertilized egg) can develop into the trillions of cells in a human body, students analyze an exponential growth model for the increase in number of cells. The final section provides a brief introduction to cellular differentiation.

This activity can be used as an introduction to mitosis or to reinforce understanding of mitosis. A hands-on version of this activity is available as “Mitosis and the Cell Cycle – How a Single Cell Develops into the Trillions of Cells in a Human Body”.

In this minds-on analysis and discussion activity, students review mitosis and meiosis as they compare and contrast these two types of cell division. The Teacher Notes for this activity include an optional mitosis and meiosis card sort for additional review.

The Student Handout is available in the first two attached files and as a Google doc designed for use in online instruction and distance learning. The Teacher Notes, available in the last two attached files, provide instructional suggestions and background information.

To begin this hands-on, minds-on activity, students view a video about ecosystem changes that resulted when wolves were eliminated from Yellowstone National Park and later returned to Yellowstone. Then, students learn about food chains and food webs, and they construct and analyze a food web for Yellowstone. Finally, students use what they have learned to understand a trophic cascade caused by the elimination of wolves from Yellowstone.

This learning activity provides an introduction to the learning activities, Carbon Cycles and Energy Flow through Ecosystems and the Biosphere and Trophic Pyramids. All three of these activities are included in Food Webs, Energy Flow, Carbon Cycle and Trophic Pyramids, which is intended for classroom instruction.

In this analysis and discussion activity, students learn that the biosphere requires a continuous inflow of energy, but does not need an inflow of carbon atoms.

To understand why, students apply fundamental principles of physics to photosynthesis, biosynthesis, and cellular respiration, the processes which are responsible for carbon cycles and energy flow through ecosystems.

Thus, students learn how ecological phenomena result from processes at the molecular, cellular and organismal levels.

In this analysis and discussion activity, students discover the reasons why (in many ecosystems) plants are more common than primary consumers, which in turn are more common than secondary consumers.

To begin, they learn about the factors that influence the net rate of biomass production. They figure out why the net rate of biomass production is lower for each higher trophic level in an ecosystem.

Then, students construct and analyze trophic pyramids. Finally, they apply what they have learned to understanding why more resources are needed to produce meat than to produce an equivalent amount of plant food.

In this analysis and discussion activity, students learn that the coronavirus responsible for the current pandemic very probably originated in bats. Students analyze how mutations and natural selection can produce a spillover infection.

Next, students learn how natural selection increased the frequency of a mutation that made the coronavirus more contagious.

Finally, students analyze how mutations contributed to the spread of the Omicron variant and its subvariants.

In this activity, students analyze information about how the coronavirus is transmitted and how to reduce the risk of coronavirus infection. Several questions engage students in thinking about how their behavior influences the risk of COVID-19 for more vulnerable individuals.

In the shorter version of the Student Handout, students learn how coronaviruses are replicated inside our cells, how white blood cells fight a coronavirus infection, and how a coronavirus infection can cause you to feel sick.

In the longer version of the Student Handout, students also learn how the respiratory and circulatory systems work together to provide oxygen to the body’s cells, and they learn how a coronavirus infection can interfere with oxygen delivery, which can result in severe disease.

This minds-on, analysis and discussion activity introduces students to the process of natural selection, including key concepts and vocabulary.

In addition, students analyze several examples to learn about the conditions that are needed for natural selection to occur.

(This activity is an expanded version of the first section of the hands-on activity Evolution by Natural Selection.)

In this minds-on analysis and discussion activity, students interpret evidence concerning natural selection in the peppered moth.

This evidence includes (1) the results of experiments that evaluated predation by birds on different color forms of the peppered moth in different environments, (2) the genetic basis for the different color forms, and (3) correlated changes in both the environment and the frequency of each color form in industrialized and rural regions in England and the US.

This activity will help students to consolidate a scientifically accurate understanding of the process of natural selection.

(This activity is very similar to the last section of the hands-on activity Evolution by Natural Selection.)