A tundra is a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen. Grass lands are a<span> large open area of country covered with grass (like the name suggests).</span>
The answer is A. There was more energy escaping into space than being trapped by the atmosphere
Answer:its c
Explanation: because cells need the nutrients from any substance that has the energy carbon dioxide is like for oxygen
Answer: Eating excessive quantities of such molecules could deregulate this process, increasing methylation and repressing the expression of genes that should normally be expressed.
Explanation:
DNA methylation is one of the epigenetic mechanisms involved in the regulation of gene expression, because it is a process by which methyl groups are added to DNA.
Methylation then modifies the function of DNA when it is found in the promoter gene, it is essential for normal development and is associated with a number of key processes, including genomic imprinting, inactivation of the X chromosome, repression of repeating elements, aging, and carcinogenesis. Usually, <u>it acts to suppress gene transcription.</u>
For example, folic acid is essential for the rapid cell division that occurs during early fetal development and it also plays an important role in methylation and thus in gene regulation. <u>The metabolism of these vitamins is aimed at achieving adequate levels of DNA methylation, necessary for the cellular processes</u>. Eating excessive quantities of such molecules could deregulate this process, <u>increasing methylation and repressing the expression of genes that should normally be expressed</u>.
The abnormal or unusual side pockets in a hollow organ, such as the intestine is called Diverticula. A gut diverticulum is an outpouching of the wall of the gut to form a sac. It may occur at any level from aesophagus to colon. A true diverticulum includes all three layers of the gut; the lining mucosa, the muscularis, and the outer serosa; while the flase diverticula are missing the muscularis thus, they are thin walled.