Warmer. Because a long time ago when Europeans did trade they had fight against hot desert like the kalahari desert
<span>The embryonic period is the most important phase of development for organ formation. The embryonic period in humans begins at the moment of fertilization and continues until the end of the tenth week of gestation. Rapid growth and differentiation occurs during this period, which produces varied cell types.</span>
Answer:
They are called Trace elements
they function as catalysts for enzymatic reactions
in some oxidation-reduction reactions (Cu) for some metabolic reactions to for ATPs synthesis,and
also as oxygen carrying elements in Hb and myoglobin muscles e,g(Fe)
Explanation:
Basically Trace elements are group of minerals in small quantity in living organisms.Their functions may be important or essential to the organisms,or needed in small amounts non essentials.
Example of these elements are Fe,Zn,Se,Cu,I,Mn Mb. etc
They are also involved in prevention of some diseases .Generally when they are consumed in large amounts they are toxic to living cells.
others like aluminum, cadmium, mercury lead may beneficial to living organisms,but there role has not yet be verified.
Answer:
The amino acids are important for the growth of almost all the organisms from the yeast to humans. While culturing yeast at the lab conditions, proper growth media is required.
The yeast is not able to make leucine. When this yeast is grown in the YPD plate, the growth of yeast is supported. The YPD consists of peptones, glucose and yeast extract. This media is enriched with all the components required for the yeast growth. The SD plate is also known as synthetic plate that do not contain the essential amino acids and consists of only nitrogenous bases. The mutant yeast will unable to grown in this media as leucine is not available. The mutant can be grown on this plate if the plate is supplied with the external media consisting of leucine and other essential amino acids.