Bio accumulation of DDT lead to bird eggs with weak shells and non viable offspring. The lethal effects of DDT on birds was first noted in 1950; scientists discovered that earthworm was accumulating the DDT pesticide and that the robins that were preying on the earthworms were been poisoned. Further research revealed that the chemical cause thinning of the egg shell and production of non viable offspring. The chemical has since been banned in USA.
Answer:
The correct answer is - through facilitated diffusion and active transport.
Explanation:
Glucose is a six-carbon sugar molecule that is directly utilized by cells to provide energy. A glucose molecule is large enough to go through a cell membrane with simple diffusion.
Cells help glucose molecules to cross the cell membrane through facilitated diffusion and active transport. Active transport is of two types primary and secondary active transport to help the glucose molecule to cross the membrane.
Thus, the correct answer is - through facilitated diffusion and active transport.
Answer:
The cytoplasm
Explanation:
Prokaryotic cells do not have nucleui so their DNA floats around in the cytoplasm.
Answer:
When a species of mosquito or insect is resistant to any chemical, it is good for the species of the mosquito because it does not kill it, but if it seeks to combat it in crops or in human environments it is dangerous.
Explanation:
Whenever a mosquito or a species is resistant to a chemical, it means that it has an adaptation mechanism so as not to die, as it did before, against that chemical.
