Chromosomes females have xx and males are xy
They are ectotherms.
hope it is helpful to you
The two biggest reasons for children spending less time outside are the development of technology and the safety issues. The development of technology brought in our homes countless forms of having fun which is very important to children. The mobile phones, PC's, laptop's, tablets, Sony Play Station, as well as lots of technologically improved toys, made the children stay at home since they have the fun indoors, and not be interested in going outside and in nature. Also the safety issues in lots of parts in the world made the parents to restrict the children to the indoors environment.
Your answer is gravitational forces
Yes it is, an example is a group of animals not treated with it died, but the animals that were survived--
