Top answers

Biology
GCSE

Briefly explain how Darwin formulated his theory of evolution by natural selection.

Darwin made four key observations in his studies of wild populations: members of a population of the same species vary in their traits; traits can be inherited, or passed from parents to offspring; popula...

ZL
Answered by Zak L. Biology tutor
2982 Views

Describe the structure of a typical animal cell and explain the functions of its components. How does this compare to the structure of a plant cell?

Cells are the smallest unit of life that make up every living thing. A typical animal cell is made up of a cell membrane, which maintains its structure and controls what goes in and out of the cell. Enclo...

ER
Answered by Emily R. Biology tutor
8987 Views

What are the differences between diffusion and osmosis?

Both these processes involve the movement of molecules from an area of high concentration to low concentration. They are also both passive processes, so happen without the use of chemical energy. However,...

PT
Answered by Phoebe T. Biology tutor
4385 Views

Explain the causes and effects of increasing levels of carbon dioxide in the atmosphere

Carbon dioxide is a greenhouse gas that is produced through the burning of fossil fuels such as coal, oil and gas. Increased demands for electricity, heating and cars etc. means that more fossil fuels are...

LK
Answered by Lydia K. Biology tutor
20990 Views

What does a vaccine contain?

Short answer: Dead and/or inactive pathogens. Explanation (also to a further question: "How does this prevent infection later?") : Pathogens are microorganisms...

MS
2958 Views

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