1. Life’s Interactions Vocabulary you should know by now: Biotic Abiotic
Predator
Prey
Host

2. Think of the earth as ship in a bottle
Especially when considering the properties of
Mass and Energy

3. No, the total amount of mass is constant!
MASS of the Earth =  × 1024 kg
5,973,600,000,000,000,000,000,000 kg
Can the ship OR the earth gain more mass from the outside?
No, the total amount of mass is constant!
(except meteorites)
So on Earth, the Mass is constant; meaning the Earth, like the ship, is a CLOSED System

4. Yes, energy (sunlight) is always being absorbed
Can the ship or the earth gain more energy from the outside?
Yes, energy (sunlight) is always being absorbed
(the sun powers photosynthesis and the greenhouse effect)
So on Earth (like the ship) ENERGY is always coming in, meaning the Earth in this sense is an OPEN System
Best guess: 1350 Watts per square meter at the top of the atmosphere

5. Biotic: referring to anything that is living or once was living
Biotic: referring to anything that is living or once was living . (Organic)
Abiotic: referring to anything that is not alive and never has been.
(Inorganic)

6. Learning Objectives:
Pg 92 & 93
Different Species may have several types of relationships with each other.
You must be able to tell the difference between :
Competition
Predation (Predator-Prey)
Symbiosis:
Mutualism
Commensalism
Parasitism

7. Competition:
When organisms (same species or not) use a resource in the same place at the same time (see definition of niche)
The majority of direct physical competition will be with-in the same species
Will compete for: Food, Water, Mates (in species), territory, sunlight (plants) & any perceived future access to these

8. Predation:
When organisms capture and feed on another organism costing the other organism’s life (predator-prey relationship)

9. Symbiosis: There are 3 main types of Symbiosis: Mutualism Commensalism
Any relationship in which 2 species live closely together
There are 3 main types of Symbiosis:
Mutualism
Commensalism
Parasitism

10. Symbiosis: Mutualism (+/+)
Both Species benefit from the relationship; both gain something
Ex: Bee gets nectar
Flowers get pollinated
Cleaner Fish gets food
Other fish gets clean

11. Symbiosis: Commensalism (+, 0)
One Species benefits while the other is not helped or harmed
Lichen or Orchids on Trees
Barnacles on whales

12. Symbiosis: Parasitism (+, -)
One Species (a parasite) lives on or inside another organism and harms it
Examples:
Heart worms
Tape worms
Fleas
Ticks
etc…