What's the head structure in mammals made of dead bone and without a covering?

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

Which of the following is not a potential result of deforestation?

Nucleus has two lobes; contains granules of lysosomal enzymes; functions in attacking parasitic worms and plays complex roles in inflammatory diseases like allergies and asthma. what blood cells are described?