Now, imagine that a population of tortoises stays in this environment with the higher-up food sources. But another population of tortoises migrates (moves to) a different environment that is covered in dome-shaped rocks. In this environment, it is an advantage to have a dome-shaped shell for camouflage, so the tortoises with the dome-shaped shells have an advantage and are not eaten as much as the tortoises with the other shell shapes. Over time, these two populations gain differences as they are exposed to different environments. The two populations of tortoises are geographically isolated- they are so far apart that they cannot reproduce with each other. Which of the following will most likely occur after many generations of being separated? - They will become separate species.
- Both populations will go extinct.
- One population will die off.
- They will come back together and interbreed.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

"a.) well–developed vascular system."

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )