Single-celled organisms exchange gases directly across their cell membrane. However, the slow diffusion rate of oxygen relative to carbon dioxide limits the size of single-celled organisms. Simple animals that lack specialized exchange surfaces have flattened, tubular, or thin shaped body plans, which are the most efficient for gas exchange. However, these simple animals are rather small in size.
In order to float in water, the density of an object has to be less than the density of the water. Since saltwater has a higher density than fresh water, a person will float more in the ocean than they would in a lake
Protein provides 4 calories per gram. Mary is on a diet that requires her to eat at least 40 grams of protein each day. She’s eaten 152 calories of protein today. How much more protein does Mary need to eat to meet her goal?
152/4=38g
2g is your answer
Answer:
The skeletal muscle fibres are of two types namely slow-twitch muscle fibres (type I muscle fibre) and fast-twitch muscle fibre (type II muscle fibre).
The slow fibres are slow contracting and help in developing endurance such as long distance running, maintaining posture etc whereas fast fibres are fast contracting and help in movements which require force such as sprinting etc.
Other differences are summarized in a tabular form attached below.