Answer:
Both fish and bird embryos possess gill slits and gill arches.
Explanation:
Embryology -- the study of embryos -- is a fundamental area that is correlated to evolution. Together, <u>they have provided evidence that we all evolved from a common ancestor.</u>
This area of study has showed that embryos that look completely different as adults share many similarities during their development. This is the case of numerous species, such as humans and birds and fish and birds.
<u>Both fish and bird embryos possess gill slits and gill arches</u>. However, <u>only fish possess them as adults. Gill slits develop into gill individual openings and gill arches will eventually support these gills. In contrast, adult birds do not possess gills, they are only present during their development.</u> This provides significant insight into the previously mentioned common ancestor theory.
Answer:
keystone species
Explanation:
Keystone species are species that are very critical to the balance and existence of an ecosystem. They are important species that play a major role in determining the overall diversity in a particular ecosystem. The presence or the removal of a keystone species from an ecosystem would certainly have an effect on the existence of other species in that particular ecosystem.
For example, the gray wolf in the Yellowstone ecosystem can be regarded as a keystone species, as their removal brought about an avast and drastic change to the ecosystem of the park. The gray wolf's predatory activities is said to be fundamental and important in maintaining the balance of the ecosystem of the park and also maintaining its overall species diversity.
The cell's structure is given by the cytoskeleton found in the cytoplasm of cells. The cytoskeleton is made up of complex fibers throughout the cell that was discovered after a second glance at cell with improved microscope technology. It serves the same purpose as bones and muscles in the body, aka, it forms shape, keeps organelles in place and directs movements of organelles.
