Fill in the blanks with suitable words : (i) ……… percent of the drugs currently sold in the market worldwide are derived from plants.
(ii) Broadly utilitarian argument says that biodiversity plays a major role in……that nature provides.
(iii) Amazon forest estimated to product through photosynthesis........percent of the total oxgyen in the earth's atmosphere.
(iv) The........... argument for conserving biodiversity relates to what we owe to millions of plants animal and microbe species with whom we share this planet.

Answer

**Step-by-Step Solution:**

1. **Statement (i)**: The question asks for the percentage of drugs derived from plants. The answer is **"more than 25%"**. Therefore, the completed statement is: "More than 25 percent of the drugs currently sold in the market worldwide are derived from plants."

2. **Statement (ii)**: The statement discusses the utilitarian argument regarding biodiversity. The suitable word to fill in the blank is **"ecosystem services"**. Thus, the completed statement is: "Broadly utilitarian argument says that biodiversity plays a major role in ecosystem services that nature provides."

3. **Statement (iii)**: The question is about the percentage of oxygen produced by the Amazon forest. The correct answer is **"20%"**. Therefore, the completed statement is: "Amazon forest estimated to produce through photosynthesis 20 percent of the total oxygen in the earth's atmosphere."

4. **Statement (iv)**: This statement refers to the ethical considerations of conserving biodiversity. The appropriate term to fill in the blank is **"ethical"**. Hence, the completed statement is: "The ethical argument for conserving biodiversity relates to what we owe to millions of plants, animals, and microbe species with whom we share this planet."

**Final Answers:**
(i) More than 25%
(ii) ecosystem services
(iii) 20%
(iv) ethical

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