- Life Sciences
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died out. This extinction marked the disappearance of the dinosaurs.
water-proof, waxy suberin-thickened layer on the radial and transverse cell walls of the...
the tube through which urine passes from the bladder to the exterior.
all the different living organisms on the Earth from the smallest micro-organisms to the largest...