It is because we have no way to make them. It is like sunlight. We don't need it but plants do. Our bodies are made of several elements and without them we would cease to live.
Humans need to express glands to release hormones and other substances that regulate bodily functions and maintain overall health.
The 2 main substances needed to start a rainbow are water and sun.
some of the substances that need help to get into a cell would be carbohydrates, such as glucose and fructose, charged ions (H+, C-4), or substances moving against a concentration gradient. those are the main ones but not necissarily all of them.
There is no main predator of the angwantibos, except humans. The young angwantibos need to be careful of Eagles and large snakes.
Substances such as nutrients, oxygen, and water need to penetrate all parts of a living cell to support its metabolic processes and maintain its function. Waste products and signaling molecules also need to move throughout the cell for proper communication and waste removal.
Vitamin D is a class of prohormones that is used by animals to make steroidal hormones. Plants do not need these compounds.
A dietary supplement is meant for aiding in the effectiveness of weight loss. The dietary supplement is not meant to help lose weight on its own. There would need to be dietary and exercise changes in order to complement the supplement's effectiveness.
A lot of kelp and tofu ;)
The body does not need any dietary starch.
Yes, generally dietary managers have a Certified Dietary Manager (CDM) or Certified Food Protection Professional (CFPP) certification. The Dietary Managers Association website offers information on degree programs. http://www.dmaonline.org
Dietary supplements do not require FDA approval before being marketed to the public, as they fall under the Dietary Supplement Health and Education Act (DSHEA) of 1994. This includes vitamins, minerals, herbs, amino acids, and other substances intended to supplement the diet. Manufacturers are responsible for ensuring the safety and labeling of their products, but the FDA only intervenes post-marketing if a product is found to be unsafe or misleading.
While it is true that human beings need the sun, and we also need oxygen to survive, the main source of energy for humans is the food we eat.