Top answers

Explain how the lungs are adapted for gaseous exchange.

The lungs are made up of tiny sacs called alveoli which presents a very large surface area for gaseous exchange. The lungs are well supplied with blood due to lots of capillaries covering the alveoli, consta...
JT
Answered by Jonathan T. • Biology tutor
59537 Views

How do organisms obtain energy?

Organisms, such as humans, take in "substrates" such as glucose, in our food. During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; this takes...
AR
Answered by Alastair R. • Biology tutor
33719 Views

Why food needs to be digested?

Food constitutes of a mix of nutrients, which cannot be used unchanged from the organism to cover its special needs. Digestive system is designed to convert complex molecules (like carbohydrates and proteins...
IT
Answered by IOANNA T. • Biology tutor
15542 Views

Garlic contains a chemical called Allicin which has antimicrobial properties. Describe how this could have occurred through natural selection.

Allicin has antimicrobial properties and can therefore protect garlic from fungal and bacterial infections and is coded for in the DNA of the garlic by an allele. The presence could have been the result of w...
LC
Answered by Lorenzo C. • Biology tutor
7205 Views

What are the modes of genetic inheritance?

Genetic conditions can be passed on from parent to offspring in a number of different 'patterns;' these are the modes of inheritance. In autosomal dominant conditions, only one mutated copy of the gene is re...
AY
5876 Views