General Science Questions

A clade is a group of ancestral species and all its descendants. Hence it is a branch of one same species and so monophyletic.

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

Mortar is a mixture of cement or lime as a binder, sand and water.

The sources of energy during exercise are muscle glycogen, blood sugar, blood fatty acids and intramuscuar triacylglycerols.