Download 1. All living things need water to survive. 2. All living things grow

What Do We Know?
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1. All living things need water to survive.
2. All living things grow, develop and reproduce.
3. Some living things breathe.
4. All living things have a habitat.
5. All living things adapt to their environment.
6. All living things compete for resources.
7. Some organisms live together.
8. Organisms interact in different ways.
Describe life in a Saguaro cactus:
Describe life in a Saguaro cactus:
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Many species live on, in or around the cactus.
Hawks live in a nest
Owls live inside the cactus.
Rattlesnake looks around the cactus for food.
Bats feed on the nectar from the cactus’s flowers.
Each organism has unique characteristics.
These characteristics help the organism survive in
this environment.
I. Adapting to the Environment
• A. Natural Selection
• 1. Natural Selection is a process by which
characteristics that make an individual better
suited to its environment become more
common in a species.
• 2. Natural selection results in adaptations.
A. Natural Selection
• 3. Adaptations are behaviors and physical
characteristics that allow organisms to live
successfully in their environments.
• 4. Over time, poorly suited characteristics
disappear from the species.
B. Niches
• 1. Every organism has a variety of
adaptations that are suited to its specific
living conditions.
• 2. The role of an organism in its habitat or
how it makes its living is called its Niche.
B. Niches
• 3. A niche includes: type of food, how it
obtains the food, what eats it, and how the
organism reproduces and conditions to
survive.
II. Types of Interactions
• C. Competition
• 1. Competition is the struggle
between organisms to survive as
they attempt to use the same limited
resources.
• 2. An ecosystem has limited food, water and
shelter.
Specialization of Species
• 3. How do species coexist?
• Organisms must have adaptations that
enable them to reduce competition in order
to survive.
• Organisms “specialize” in their role/niche to
survive.
D. Predation
• 1. An interaction in which 1 organism kills
another for food is called predation.
• 2. The Predator does the killing while the
Prey is killed.
• 3. Predators and Prey have adaptations for
survival.
E. Symbiosis
• 1. Symbiosis is a close relationship
between 2 species that benefits at least
1 of the species.
Mutualism
• 2. Mutualism is a relationship where both
species benefit.
• Example =
• 1. Bats and the Saguaro Cactus
• 2. Acacia trees and Stinging Ants
Commensalism
• 3. Commensalism is a relationship in which 1
species benefits and the other is neither
helped nor harmed.
• Example =
• 1. Hawks build a nest in the cactus
• 2. Owls living in the cactus
• 3. Not very common in nature.
Parasitism
• 4. Parasitism involves 1 organism living on or
inside another organism and harming it.
• a. the organism that benefits is Parasite
• b. the organism that is harmed is the Host
• Example =
• 1. Fleas, ticks and leeches
• 2. Tapeworms
• 3. Mites living in the ears of Moths
Parasite/Host
What did We Learn?
• 1. Organisms adapt to their surroundings.
• 2. Natural selection is a process in which species become
better suited to their environment.
• 3. Organisms have niches, which are their roles.
• 4. Some organisms are predators.
• 5. Specializing can reduce competition.
• 6. Organisms use defense strategies to avoid predators.
• 7. Some organisms live together in symbiotic
relationships.
• 8. 3 type of Symbiosis include: Mutualism, Commensalism
and Parasitism.