The inner core is composed of solid nickel and iron
semisolid rock
magma
O liquid nickel and iron
O the asthenosphere
solid rock

Name the glands associated with human digestive system

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?