<span>Ideally, sustainable development should preserve the environment and ecosystems while being continually implemented. For example, solar energy is sutainable because you can't spend it by using it. Oil is unsustainable becasue it will run out and you can't replenish it in time. Wind energy is also sustainable.</span>
Answer:
2n to n, n to 2n
Explanation:
Meiosis is known as reductional division because in meiosis the chromosome number gets reduced to half in daughter cells so when sperm and egg cells undergo meiosis than the chromosome numbers get reduced from 2n to n. In humans, the chromosome number is 46 and it gets reduced to 23 after meiosis.
When egg is fertilized by the sperm than the two chromosomes comes in the same cell and the number goes from n to 2n that mean in human it goes from 23 to 46.
An aphotic zone is a zone where light can be received from the sun (or other sources of light).
For example in the ocean, it will be the zone that begins a 200m deep and goes to the bottom of the sea.
Hope it's helpful, have a nice day :)
Psuedopodium is the temporary projection that certain one cellular organisms use for mobility including some amoeba.
