Lymph is a milky fluid that contains lymphocytes, a type of white blood cell. Plasma is the liquid component in the blood, while serum is the protein-rich fluid that remains after blood clots. Blood comprises two fluids and it also carries hormones, nutrients, infection-fighting cells, and oxygen. Glands produce sweat, saliva, tears, and breastmilk. Glands are organs in the body that create and release chemical substances through ducts. These fluids help the body to work properly. The human body is composed mostly of water, which our body uses to produce different fluids. Blood, sweat, saliva (or spit), tears, breastmilk, semen, urine, mucus, lymph, plasma, serum, and digestive juices. There are three orders of mammals: monotremes (egg-layers), marsupials (pouched mammals), and placentals (which account for the majority of mammals, including humans).Ģ. Scientists believe that mammalian ear bones (the malleus, incus, and stapes) evolved from bones that were no longer needed, such as a bone to support gills. Their skulls have adapted over time to support their elaborate chewing muscles, and to better contain their large brains. Mammals have large brains with modified skulls, complex teeth, and three ear bones. Mammals have hair or fur at some point in their lives, and the females produce milk for their young through mammary glands. They are also able to maintain a constant body temperature, which is called being warm-blooded. All mammals have backbones, are warm-blooded, have hair or fur, and drink their mother’s milk when they are born.Īll mammals are vertebrates, which means they have backbones, unlike worms or insects. How can you use a lemon to light a light bulb?ġ. What is the goal of a double-blind, placebo controlled study?ġ5. Why is it colder an hour after sunrise than it is at sunrise itself?ġ4. the direction water travels to the sea.ġ2.the Northern Hemisphere from the Southern Hemisphere.which animals are nocturnal and which are diurnal.What are the four major directions? In which direction does the needle of a compass point? Each year, Earth revolves once around what?ġ0. At the same pressure, which is more dense-hot air or cold air?ĩ. What happens over time when iron is exposed to oxygen?ħ. What mineral is found in a saline solution?Ħ. Name some characteristics of all mammalsĤ. Sample Questions from 101 Things Everyone Should Know About Science!ġ. 101 Things Everyone Should Know About Science, written by Dia Michels and Nathan Levy is offered by Educational Innovations for $9.95. Endorsed by science organizations and educators, this book is perfect for kids, grown-ups, and anyone interested in gaining a better understanding of how science impacts everyday life. Key concepts in biology, chemistry, physics, earth, and general science are explored and demystified by an award-winning science writer and a seasoned educational trainer.
Using an accessible question-and-answer format, 101 Things Everyone Should Know About Science expands every reader’s knowledge. A hot air balloon is never an ‘evidence’ of the non-existence of gravity.Science affects everything-yet so many of us wish we understood it better. The physics of a hot air balloon is very well understood. The force of gravity still exists, only smaller than the buoyant force exerted on the hot air inside the balloon. Just because the balloon rises upwards, it doesn’t mean there is no force of gravity acting on it. Conversely, if the force of gravity is greater than its buoyancy, the balloon will descend. If buoyancy is greater than the force of gravity, then the balloon will rise. It is caused by the gravitational acceleration exerted by the Earth.
It is caused by the hot air inside the balloon having less density than the air surrounding it. In the case of a hot-air balloon, there are at least two forces at work: We can sum all the forces to find its resultant force, and the object will accelerate to the same the direction of this resultant force. These forces can have different direction and magnitude. More than one force can work with an object at the same time. They believe things go up or down because of density. To them, the fact that a hot-air balloon rises is an ‘evidence’ that gravity does not exist. The basic physics escape most flat-Earthers. If buoyancy is greater than the force of gravity - or the weight of the balloon-, then the balloon will rise. Buoyancy is the upward force that is exerted on the trapped hot air because its density is lower than the surrounding air. A hot air balloon rises because it has buoyancy.
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