Conduction- 
putting an icepack on injury
grabbing a warm coffee mug
burning yourself by touching boiling water
the handle of a pot being to hot to touch 
Convection-
heat from a fire to warm hands
warm water rising to the surface of of the ocean etc.
warm air rising off pavement
an oven that cooks by cycling warm air through the bottom and out the top
Radiation-
cooking popcorn using microwave
heat from the sun hitting a solar panel
( i havent done science in a while cuz im homeschooled but i think most of these are correct) 
good luck on what your working on !!
 
        
             
        
        
        
Answer:
Scandium is the smallest element of the four
Explanation:
Vanadium = 50.9415 u
Titanium = 47.867 u
Scandium = 44.955912 u
Chromium = 51.9961 u
 
        
             
        
        
        
Answer:
Explanation:
1. A measure of how quickly velocity is changing is the acceleration
Acceleration is the rate of change of velocity with time. The rate at which a body is changing its velocity is known as the acceleration. 
It is measured in the unit m/s²
2. Speed in a given direction is the velocity 
Velocity is a vector quantity which measures the magnitude of motion in a specific direction. It is simply speed in a given direction. 
When we say a motorcycle travels at the rate of 5m/s due east, we are describing the velocity of such body. 
3. Force that resists moving one object against another is the friction 
Friction is a force that opposes motion. It prevents a body from moving. 
4. Measure of the pull of gravity on an object Weight
Weight is a measure of the amount of gravitational force on a body. It is mathematically expressed as; 
          W = mg 
 W is the weight, m is the mass and g is the acceleration due to gravity
5 Tendency of an object to resist a change in motion is inertia
Inertia is the tendency of body to resist change in motion. It is the ability of a body to remain in a perpetual state of rest. 
6 Size is the magnitude
 
        
             
        
        
        
I know CL is chlorine and NA is sodium.
        
             
        
        
        
Yes because obviously some other organism lives off eating that organism so if they die off the other organisms will be affected heavily