Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Chloroplasts, they help the plant cells to perform photosynthesis which animal cells do not need
By looking at the diagram, and my knowledge of Punnett squares, i would say B. 4:16
Global warming is a long-term rise in the average temperature of the Earth's climate system. And the greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.