It means that they are safe, wholesome, and correctly labeled and packaged.
To prevent cells from either shrinking or swelling you should keep them in an isotonic solution. Isotonic solution is a solution with equal amount of solute and solvent. Therefore, when cells are placed in such a solution they will not lose or gain water, as opposed to hypertonic (more solute than solvent) and hypotonic (more solvent than solute) solutions.
They are all examples of:
B. Steroids
Explanation:
- Cholesterol is the most common steroid and is the precursor to vitamin D.
- Estrogens are a group of steroid hormones that control the development and maintenance of an individual's feminine characteristics.
- Testosterone is the primary male sex hormone and anabolic steroid.
Answer:
The Struggle for Survival refers to the fight between organisms to survive by having access to the increasingly scarce resources in the environment brought upon by population increase.
Darwin believed that evolution was brought about by external pressures arising from this struggle for survival as species would have to adapt to the unique challenges in their environment to be able to better access resources.
This is why one must understand the challenges in an environment to understand why species in that environment evolved the way they did.