Answer:
When the required direction of transport is opposed to concentration levels, a cell <u>will </u> expend energy to force<u> ions</u> across its membrane.
Explanation:
If the concentration gradient is opposite to the direction of transport of minerals, then the cell will use energy to transport mineral ions from a lower concentration to a higher concentration. The most common process through which this happens is termed as the active transport.
The process of active transport is opposite to passive transport. In passive transport, molecules move from a higher concentration to a lower concentration.
The immune system has many kinds of white blood cells to fight infections. HIV finds the white blood cells, called CD4 cells. But with cancer the white blood cells are being killed off.
Snowy white egrets eat mostly aquatic animals, including fish, frogs, worms, crustaceans, and insects. The base of it’s bill, near it’s eyes, turns red during mating season. Male and female egrets are very similar in appearance.
Answer:
it is because plant releases oxygen into the air for other living thing to breath
Less water-soluble substances will reach the deeper part of respiratory system. That means a substance which more water-soluble(ammonia, formaldehyde, hydrogen chloride) will only damage upper respiratory systems like trachea or bronchus.
High water soluble substance also more irritating.