Optical microscope.
Hope this helps.
Fetus can survive an extra copy of a chromosome, but being hemizygous is <span>usually fatal</span>
Sphenoid bone spans the width of the cranial floor; keystone of the cranium <span>because its central wedge articulates with every other cranial bone </span>
Koalas, scientifically known as <em>Phascolarctos cinereus</em>. They found in the variety of habitats such as coastal islands and eucalyptus forest. They live in societies and rely on genetic diversity for survival like any other species. But in case of Koalas, the genetic diversity low over 120 years. Low diversity indicates that they practice inbreeding for reproduction. As a result the population size decreases.
