<span>Frog lungs are poorly developed because they don't use them that much. Their skin is moist and very thin because it takes part in their respiration because their lungs are underdeveloped. Skin has pores and breathes as well but in humans it's not very much used because we have good lungs, but frogs' skins are very important for them because they couldn't get oxygen without it.</span>
Windmill maker to straw, pins, a bottle and a box of Kleenex?
Answer:
An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Answer;
-Zygote
When sperm and ovum unite at conception, a zygote results.
Explanation;
-Conception occurs when a sperm cell from a fertile man swims up through the vagina and into the uterus of a woman and joins with the woman's egg cell (ovum) as it travels down one of the Fallopian tubes from the ovary to the uterus.
-A zygote is the union of the sperm cell and the ovum. Also known as a fertilized ovum, the zygote begins as a single cell but divides rapidly in the days following fertilization. After this two-week period of cell division, the zygote eventually becomes an embryo.
