The brown adipose tissue (BAT) makes up about 5% of a newborn's body weight. Newborn babies cannot yet efficiently thermoregulate themselves because they are so young. The BAT helps a baby's body with non-shivering thermogenesis when the body falls below a certain temperature. It also serves as cushioning and protection for the body parts.
A rabbit is a mammal, and as such it is an endotherm. He produces his own heat from the energy he gets from his food, and has no need of an extern source like the sun or a radiating lightbulb.
A newborn piglet will need to be kept warm since they can't generate their own heat. They will also need to be fed, given iron supplements, and vaccinated.
Yes
A source of heat.
Lizards are cold blooded and need heat from the sun.
just like any other terrestrial mammal... to prepare for reproduction
EM (or emergency heat) can be used if you have a problem with your other heat source such as a heat pump. In most cases, you will not need this but what it does is bi-passes the primary heat source and allows your secondary heat source (normally your furnace) to become the primary.
To create a fire you need a fuel source of some kind, oxygen (O2), and a heat source.
What needs a heat source to begin evaporating. Normally the sun is the heat source that evaporates water on the earths surface.
Fuel, oxygen, & an energy (heat) source.
yes they need some heat source during their first part of life.
A newborn mammal (such as a rat) does not need (and could not deal with) ANYTHING but its mother's milk. It is not until it is weaned that it will start taking solids.