Learn how to find mean, median, mode, and range with a frequency table. A frequency table organizes data so finding the range is easy. For the range just subtract the smallest from the largest number.
The mode is the number that appears most often.
The median is the number in the middle and the mean is the average.
I show you how to find each of these statistics easily from a frequency table.

The Phanerozoic Eon is part of the geologic timescale.
This Eon consists of three major eras.
The Paleozoic era, the Mesozoic era, and the Cenozoic era.
The Paleozoic era is also called the "ancient life".
Life echinoderms, trilobites, and jawless fish roamed the ocean along with sharks.
Tetrapods crawled out of the ocean and started living on land.
Insects began to spread along with reptiles and amphibians.
The supercontinent Rodinia broke apart and then drifted back together creating Pangea.
The Mesozoic era is called the "age of reptiles".
Dinosaurs prospered during this era.
The Cenozoic era can be called the "age of flowering plants" or the age of the insects."
Mammals, flowering plants, and insects all prospered during this era.

Learn how to find the area of a square using the diagonal which creates a 45 45 90 triangle. The special rules of a 45 45 90 triangle can be used to find the side length.

Digestion begins in the oral cavity which we normally call the mouth. The mouth is responsible for mechanical and chemical digestion and prepares the food for digestion. I explain the role of the mouth in digesting food. The mouth has a very important function in digesting food..
The mouth has 32 teeth that help with mechanical digestion and amylase that helps with chemical digestion.

Learn how to read a dichotomous key which is used in classification in order to help identify objects.
In this example, I classify 3 monsters. The first thing to remember is to always start at 1A with each new object that you are classifying. Because each question has two parts you should always start at the A question and then the question will tell you where to go next.

If you live in the united states,canada, or Australia, you use a 12 hour system for telling time.
If you look at this clock it is 7 oclock. However is this 7 oclock in the morning or 7 oclock at night. This is where am and pm help
.The 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each. The first 12-hour period is designated as am. It runs from midnight to noon. The second period, marked pm, covers the 12 hours from noon to midnight.
AM comes from the latin phrase ante meridiem, which translates to, before midday)
and p.m. from the Latin phrase post meridiem which translates to, past midday
There are 24 hours in a day, this requires the hour hand to pass the 12 twice.

Learn how to add and subtract using scientific notation

Learn about the first four planets called the terrestrial planets and the gas giant planets called the Jovian planets.
The terrestrial planets include Mercury, Venus, Earth, and Mars.
These planets are small, rocky, and close together.
The Jovian planets in Jupiter, Saturn, Uranus, and Neptune.

Limiting Factors in an ecosystemAny biotic or abiotic factor that restricts the number or production of organisms is a limiting factor.

Take this ecosystem found in the fishbowl
The limiting factors would be the size of the bowl, amount of water, will limit the number of fish that can survive in the fishbowl

Limiting factors can be dependent limiting factors and independent factors

Dependent limiting factors depend on the number of organisms
For example, the amount of food available for each organism depends on the number of organisms
An independent limiting factors does not depend on the number of organisms.
For example, the amount of rainfall does not depend on the number of organisms

You also have

Density-Dependent Factors
A limiting factor that depends on population size is called a density-dependent limiting factor.

Density-dependent limiting factors include:
• competition
• predation
• parasitism
• disease

Here is a list of abiotic limiting factors
Sunlight
Climate
Temperature
Water
Space
Soil chemistry
Fire
Natural disasters


Biotic factors limiting factors
Number of plants
Number animals
Amount of competition
Number of decomposers
parasites
Disease causing agents

Wetlands are ecosystems found on Earth that are covered with water for most of the year.
In this video, I cover the difference between a swamp which has trees and a marsh that mainly has grass and reeds.
I also cover a bog that receives on rain or snow and fen that has a water source feeding it.

Compare and contrast tornados, hurricanes, and thunderstorms Each of these extreme weather events can cause great damage and are very powerful but they each form in a unique way.

0:00 Introduction to Extreme Weather
0:10 How do tornadoes form?
01:43 How do hurricanes form?
03:09 How do thunderstorms form?