A balanced diet is a diet containing food from all the different categories of food, for example Proteins, carbohydrates and Fats in the optimum quantity.
It's best to say to suit an individuals needs but you will still get he mark
What is an advantage of preserving an endangered species? (1 mark)
Explain how lichens can be used to detect environmental changes.
Lichens are used to detect air pollution. The higher the number of lichens in an area, the less air pollution there is. In contrast to that, the lower the level of lichens in an area, the more polluted the area is. An example of an area with high numbers of lichens is a countryside (far away from a city). An example of an area with low numbers of lichens is a city.
Describe what occurs when you step on a pin. (6 marks)
Darwin's theories weren't accepted as he lacked evidence to back up his proof & also because science hadn't developed to the point where genetics and DNA were discovered.
There was a lack of evidence People believed in God at the same time so there were conflicting ideas Darwin couldn't explain why there was variety in organisms
Polar bears have a thick layer of blubber which act as an insulator The have a large surface are to volume ratio which helps them store heat They have small ears which prevent heat loss They are white which helps them camouflage into the snow to hide them from predators They have a thick coat which acts as an insulator
Question, What are the different hormones in the menstrual cycle and what do they do?
FSH - Matures an egg in the ovary, inhibits (Progesterone) Oestrogen - Thickens the uterus lining, inhibits FSH, stimulates LH LH - Releases a matured egg from the ovary, inhibits Oestrogen, stimulates (Progesterone)
Lichens are used to detect air pollution. The higher the number of lichens in an area, the less air pollution there is. In contrast to that, the lower the level of lichens in an area, the more polluted the area is. An example of an area with high numbers of lichens is a countryside (far away from a city). An example of an area with low numbers of lichens is a city.
Describe what occurs when you step on a pin. (6 marks)
Ignaz semelwies introduced the concept of antiseptics. He first implemented his theory in the hospital he worked at in 1840s that helped to cut the deaths of women after pregnancy as it killed bacteria and diseases.
There was a lack of evidence People believed in God at the same time so there were conflicting ideas Darwin couldn't explain why there was variety in organisms
Q: How does genetic modification work (4 marks)
Genetic modification invloves using enzymes to splice desired genes, they are then transferred into another organism/plant where they are inserted to give the organism/plant the desired characteristics.