A chemical substance that an organism requires to live. a nutrient that is scarce or cycles slowly through an ecosystem. ensures that nutrients will be circulated throughout the biosphere.
The type of earth surface is
Cool ocean
Answer:
"The ciliary body is a circular structure that is an extension of the iris, the colored part of the eye."
Explanation:
Following gastrulation, the next major development in the embryo is neurulation, which occurs during weeks three and four after fertilization. This is a process in which the embryo develops structures that will eventually become the nervous system