CHANGE IN SPECIES DIVERSITY OVER TIME
wees
Species Diversity
Ground flora
Shrubs
Understory trees
Canopy trees
0 20 40 60 80 100 120 140 160
Time Following Abandonment (years)
1. Identify the type of ecological succession that occurred in this ecosystem.
Provide rationale for your response. *
This was primary succession because the pioneer species were ground flora.
This was primary succession because there was soil in the field at the time of
abandonment.
This was secondary succession because the pioneer species were ground flora.
This was secondary succession because there was soil in the field at the time of
abandonment.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.