A) Autotrophs
b) land mammals
c) humans
d) marine life
e) land plants
Only if they are girls! But yes they do have periods. Otherwise they could not have babies..... No matter what I'm pretty sure that girl dogs do have periods. So yes animals do have periods!
Feed design to meet the requirements of laying hens. Usually higher in energy levels, protein w/ certain amino acids increased to meet higher need and increased mineral levels especially Ca. It is ok for male bird and non laying hens to eat for short periods of time and also it is a waste of money to feed these expensive feeds to non laying birds.
While mackerel swim together in large schools, these schools do not have any school periods, so No.
Devonian, Carboniferous and Permian Periods
No
Strictly speaking, we are in an ice age now. It started about 2.6 million years ago and is composed of cold periods named "glaciations" and warmer periods named "interglacials" which is where we are now. The last glaciation ended about 10,000 years ago.
increased rest periods
Evolution.
yes
Evolution
Evolution of man.
Fiercer storms.
Mass extinction
Mass extinction
The cyst enables many organisms to survive in the environment for long periods of time without need for food or water
Increased Pressure, and increased temperature, over long periods of time.
While there are organisms that can live for long periods of time and organisms that can survive extreme conditions, there is no organism that is immortal. Unless God counts.