Answer: Exoskeleton
This is the answer to your question, hope it helps!
They are different isotopes for oxygen two of te three most stable isotopes ( 16,17,18)
Each different isotope contains different amounts of Neutrons
16 contains 8
17 contains 9
18 contains 10
In the end the only difference is quantity of neutrons and which is most stable
Answer:
6.5 cm
Explanation:
Mechanical advantage is a measure of efficiency or performance of a tool or machine in terms of force amplification which is done by the machine or tool. In simple terms, it measures that at what extent the applied force is increased with the help of tool or machine.
Mathematically, it is the ratio of force produced by the tool or machine to the force actually applied to the tool.
In terms of effort length and resistance length, it is calculated as -
Mechanical advantage = 
Thus, Mechanical advantage = 
= 6.5 cm.
<h3><u>Answer;</u></h3>
Ectoderm
During gastrulation in frogs, cells from the animal pole spread over the embryo and form the <u>ectoderm</u>.
<h3><u>Explanation</u>;</h3>
- <em><u>Gatrulation is when the three germ layers form around the embryo in preparation for the next step of embryogenesis, that is organogenesis. The three germ layers namely; ectoderm, endonderm and mesoderm are the basis of all the organs that will form after this stage.</u></em>
- Ectoderm is the outermost layer, which later froms may different lining such as the outer layer of the skin, esophagus, and many other organs. Endoderm is the inside layer of gastrula and forms the digestive tract of the embryo. Mesoderm is the middle layer and ends up becoming the skeletal muscles of organisms as well as bones, blood, and sex organs.
