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.
Answer:
Mhm
Explanation:
Without any greenhouse gases, Earth would be an icy wasteland. Greenhouse gases keep our planet livable by holding onto some of Earth's heat energy so that it doesn't all escape into space. This heat trapping is known as the greenhouse effect. ... Putting so much new CO2 into the air has made Earth warmer.
Answer:
protect the cell from its surroundings.
Explanation:
Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
Answer: 60 to 100 beats per minute.
Explanation:
Pulse is the number of times the hear pump blood out into the systemic circulation per minute
The lower this range the more efficient the heart is. In trained athletes the pulse rate is about 40bpm.
This shows the heart pumps blood at a faster rate to meet the demands of the muscles and other organs involved in the strenuous activities.
It can be measured by placing two fingers on the thumb side of the wrist,and count numbers of beats heard for 15 seconds.The counted number should multiplied by 4 to obtain beats per minute.
Answer:
A. They require a medium to travel through
Explanation:
The medium can be any substance-solid,liquid,or gas- and the wave's speed depends on the properties of the material of the medium the wave travels through.
