Answer:
The liquid nitrogen refrigerator consists of a “tank within a tank,” with insulation under vacuum between the inner and outer tanks. It should be stored in a clean, dry area, preferably on a wood stand to avoid possible corrosion from contact with wet or damp concrete.
Explanation:
The green house effect makes it possible for life to exist on earth
Answer a)
The students should only have changed one variable to test for germination of seeds. They should have just changed the seed types and rest all factors like temp, pH should be kept constant for all of them.
Answer b)
The procedure could be changed as follows. The students should place three of each types of seeds in the petri dish. They should keep all the conditions like nutrients, temperature, pH constant for all the three dishes. After this observations should be made to check which seed germinates faster.
