[[Ques]]: What can fatty acids be combined with, in addition to carbon and oxygen?
Options:
- (A) Sodium
- (B) Energy.
- (C) glucose
- (D) Carbon Dioxide
- (E) Fuel cells
- (F) Uranium
- (G) Hydrogen
- (H) Energy
[[Ans]]: [Lipids may consist of fatty acids alone, or they may contain other molecules as well. Lipids Lipids are also composed of carbon, oxygen and hydrogen. Carbon, oxygen, and hydrogen can be combined with fatty acids.]
[(G)]

[[Ques]]: Where is force on the vessel walls highest?
Options:
- (A) arteries
- (B) feet
- (C) resistance
- (D) tibial vein
- (E) strong
- (F) capillaries
- (G) femoral vein
- (H) Summer
[[Ans]]: [Blood pressure is highest in arteries and lowest in veins. What is Blood Pressure Blood pressure is the pressure on the blood vessel walls. Force on the vessel walls is highest in arteries and lowest in veins.]
[(A)]

[[Ques]]: What is a positive effect of plant needs for water and minerals from soil?
Options:
- (A) erosion prevention
- (B) reducing acid rain
- (C) It helps them survive
- (D) agriculture
- (E) nutrient deficiency
- (F) water run-off
- (G) erosion
- (H) Exfoliation
[[Ans]]:
[Most plants grow roots down into the soil to absorb water and minerals. Plant roots begin to stabilize the soil against erosion. The need for plants to absorb minerals and water from the soil also leads to them preventing soil erosion.]
[(A)]