Answer : The number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops
Solution : Given,
Density of ethanol = 0.80 g/ml
Mass of ethanol = 0.60 g
First we have to calculate the volume of ethanol.
Formula used : 
The volume of ethanol is, 0.75 ml
Now we have to calculate the number of drops it takes from a dropper to dispense 1 ml of ethanol.
As, the number of drops in 0.75 ml of ethanol = 15
So, the number of drops in 1.0 ml of ethanol = 
Therefore, the number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops
One way can be forming an ionic bond
Second way can be forming covalent bond
And finally, the third way could be forming Co-ordinate bond
In biology the term extinct is used for species which are no longer alive. so here Ava is correct because a species has died out and is not longer alive.
Endangered species are those which are on the urge of being extinct, means they are in danger so the term "endangered"
Ava can also elaborate the terms by taking examples
Dinosaurs are extinct species. They are no longer alive or not found in any part of world. So they are called as extinct.
The term can be used for animal or plant species.
A phosphorus atom gains three electrons to form a phosphide anion when forming a chemical bond to a metal I believe
There’s no pic for me to awnser your question
