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1) Identify the problem
2) Design a solution or product
3) Implement the design
4) Evaluate the product/solution
First start with making observations, and decide on the problem. You want to generate ideas, look and decide your limits, then create a solution or product. Then, build your product/solution, and put it to the test. Did it work? Identify the pros and cons of your product/solution, and decide what you could do better to improve your design.
Answer:
4) It allows the exchange of nutrients between the embryo and the mother, while at the same time filtering out harmful material.
Explanation:
The placenta is an organ present in all mammals. She is confirmed between the 6th and 8th week of pregnancy and has as main function the exchange of substances between the mother and the fetus. Among these substances are nutrients, gases and even secretions. The placenta also has the function of fighting infections and promoting immunity to the fetus, in addition, it can act as the lung, the intestine and the liver, while the fetus does not develop its organs.
Biogenesis, the fir tree began life when fertilization occurred to produce a singlee cell.
