They are formed by natural processes like anærobic decomposition. They contain energy from ancient photosynthesis. They can literally be around 650 million years old.
The savanna is very dry and desert like. Grasslands get precipitation and have tons of grass, hence the name grasslands.
Gestational age can also be estimated by measuring the fundal height. This is done by measuring from the pubic bone to the top of the uterus. The measurement in centimeters roughly equal to the gestational age in weeks from the last menstruation.
The kidney filters the blood, removing any waste products in the blood such as water, salts, urea and other products too.
I hope that's the answer you are looking for
