Increase of greenhouse gases, due to human activity, is melting sea ice at the poles. This causes changes in climate. Name three Earth spheres which interact in this process. Justify your answer.

Explain some similarities between plant systems and animal systems? Give examples.

What shows the physical trait resulting from a genotype

Give an example of how biotic and abiotic factors act together to limit population and effect carrying capacity.

Which is NOT a function of sweat? A. regulation of body temperature B. reabsorption of essential compounds C. excretion of excess salts and water

Which statement is correct about the total mass of glucose and oxygen formed during photosynthesis? It is equal to the total mass of carbon dioxide used. It is less than the total mass of carbon dioxide used.

In which specimen were cells first identified? microorganism cork bark DNA mitochondrion

The rate of soil erosion depends on?, A climate, B slope steepness, C the type of vegetation, D all of the above

High concentrations of carbon dioxide are harmful to the human body. The heart and the lungs work together to keep the body's carbon dioxide level low.

What is a niche? i need answers!

What passage carries food between the pharynx and the stomach?