<span>In the marine ecosystem fish are the producers. on land there are plants like grass, herbs and trees. But there are many ways to answer this. I hope this was ok. </span>
Gene regulation is necessary in the development of multi-cellular organisms because it is necessary to make sure certain things go where they are needed to go. Multi-cellular organisms have more organ systems, therefore depend on more cells to live. Cells have a memory; the genes a cell expresses and the way it behaves depend on the cell's past, as well as its present environment.
Answer:
The endometrium is the mucous layer that lines the uterus internally. Its function is to thicken during the menstrual cycle to allow the embryo to implant and a pregnancy can take place.Two phases of the endometrial cycle are distinguished: the proliferative phase and the secretory phase. The proliferative endometrium occurs due to tissue regeneration on the first day of the menstrual cycle, where, thanks to the production of estrogen in the ovary, cell multiplication occurs, giving rise to the endometrial glands and more blood vessels.
Explanation:
The first phase, known as the follicular phase, begins on the first day of menstrual bleeding and lasts for about two weeks. During this period, one of the ovules - which are the female reproductive cells - grows and matures within an ovary. At the same time, the ovaries produce hormones that promote the development of the lining of the uterus, called the endometrium. The lining of the uterus, the endometrium, thickens in response to estrogen stimulation, that is, over the days, the endometrium becomes thicker and rich in blood vessels, preparing to receive the egg the moment it is expelled from the ovary. When the ovum matures, around day 14 of the cycle, it separates from the ovary - the ovulation process - and slides down the fallopian tube to the uterus.
Answer: Gravitational lensing
Explanation: The arc that was seen around the galaxy by the scientist was caused by gravitational lensing; this is when a light dip and curves in the presence of huge objects.
Gravitational lensing can be simply refered to as a phenomenon where a gravitational field is created by a huge matter (cluster of galaxies) in space which distort and magnifies the lights coming from another huge matter (cluster of galaxies) from a distance but on thesame line of sight. (causing a formation of arcs of light around the huge object).