This is a theory because this has been proven by scientists years ago. The evidences to prove this theory were shown.
hope this helps!!! :) Pls mark me BRAINLIEST! :)
Answer:It is locked up in glaciers and ice caps.
Explanation:
Explanation:
Identical twins may have less in common than they think. A study now shows that the expression of their genes gets more and more different with age.
The findings could help to explain why one twin may develop a genetically influenced disease, such as diabetes, while the other remains perfectly healthy.
Identical twins have identical genes, because they are born of an embryo that splits at a very early stage in development. Such twins are often indistinguishable in outward appearance. But over the course of time they may experience radically dissimilar health.
Most scientists have assumed that environmental and lifestyle differences cause such divergence. These things trigger chemical reactions that affect our DNA and the proteins entwined with our DNA, called histones. One such reaction, known as methylation, influences the expression of genes and so can have an impact on health.
Answer:
Wall of stomach : it has three layers of muscle instead of two. Under these muscle layers is the adventitia, layers of connective tissue continuous with the omenta. The epithelium of the stomach forms deep pits, called fundic or oxyntic glands.
wall of ileum : The wall itself is made up of folds, each of which has many tiny finger-like projections known as villi on its surface. The ileum has an extremely large surface area both for the adsorption of enzyme molecules and for the absorption of products of digestion.
Answer:
D. Nitrogen Gas
Explanation:
A, B, and C all contain more than one type of molecule.
