Responses to the Environment
Responding to the environment begins with a...
Stimulus
The ___ is the primary source of energy for producers.
sun
As population increases, ______ intensifies
competition
the numbers of individuals per unit area
density
The amount of diversity in and within a species in an ecosystem.
Biodiversity
The cell structures that detect stimuli are...
receptors
Wildfires, flooding, volcanic eruptions, habitat destruction, invasive species, overhunting, pollution are all examples of...
disruptions
The number of species occupying the same habitat and their relative abundance is known as the ____ of the community.
diversity
dispersion
species that have a disproportionate effect of the ecosystem
keystone species
All organisms respond to their surroundings in order to improve their chances of ______ and _______.
Survival, reproduction
Disruptions to ecosystems can be caused by ____ or ____ ____.
nature, human behavior
The interacting populations occupying a given habitat form an ecological _____.
community
evenly spaced individuals in a population; can be territoriality
uniform dispersion
a density-dependent limiting factor
competition
What is a molecule that binds specifically to a receptor?
ligand
Biodiversity is a measurement of ____ of an ecosystem
health
What is a predator-prey interaction?
One population kills and consumes another population
an age specific summary of the survival pattern of a population; represented by a survivorship curve
life table
a density-independent factor
natural disaster
The ____ ___ changes the cell’s structure and function. It might change the cell’s ability to respond to ____ ____; it might alter the internal state; or it might change the pattern of ___ _____.
intracellular signal, external stimuli, gene expression
Living factors in an environment that can affect populations size
Biotic factors
Defenses against predation and herbivory are _____, _____, _____, _____.
mechanical, physical, chemical, or behavioral
populations are influenced by ____ and _____
natural selection and environmental factors
Disease may spread more rapidly when an area is crowded, so disease is considered to be...
density-dependent limiting factor