The biome that exist closest to the Earth's poles are descibed as polar
In the above question, if the bag refers to a dialysis bag, the membrane of a dialysis bag is a selectively permeable membrane that does not allow the movement of all molecules to diffuse across the ,membrane. Osmosis is best explained with the help of a dialysis bag. In the process of osmosis the movement of water molecules from their higher concentration to lower concentration take place across the membrane.
Thus, only water molecules will pass across the bag and limit the movement of other molecules.
The plant cell is the smallest living structure and constituent unit of all plants. Its size and shape vary by function. It is composed of several organelles, all useful to its activity.
The right answers are: (the numbers are in the picture).
1 refer to a vacuole.
2 refer to a cell wall (if you see closer, the arrow is aiming the green layer, the yellow one is the cell membrane).
3. refer to a chloroplast.
4. refer to mitochondria.
Answer: Only some of the organisms survive and reproduce.
Natural selection is a process of differential survival and reproduction in which organisms bearing favorable phenotypic traits survive in changing environmental conditions. Therefore, only some of the organisms survive and reproduce which have suitable phenotypic trait. For example a population of beetle bearing two colors red and green. The green colored beetles mimic the color of grass will remain undetected by birds and those with red color easily observed and detected by birds. Hence, only green beetles are favored for survival over red beetles.
An unknown mtDNA sample is matched to a sample of nuclear DNA that was found at a crime scene.
