Hierarchy of Biology


Hey guys! Today, let’s talk about the hierarchy of biology. So, let’s start at the very top We have, what’s called, the biosphere. So, the biosphere is all of the life on Earth as well
as all of the nonliving things that our life interacts with so think of all of
life as well as things like the atmosphere the air that we breathe things like
the hydrosphere you know all the water that we drink all the oceans that have
water our hydrosphere so all of that is part of the biosphere the Earth. Now, next up
we have biomes. So biomes are just areas of the biosphere that have similar
characteristics all right so these are things like deserts things like tundras
things like taigas things like temperate deciduous forests so these areas have
similar climates and they have similar communities of animals living within them. So in this case
Antarctica is actually a desert because it has very little rainfall. It’s
characterized by the climate now going down even further, We’ve got what are called ecosystems ecosystems Within a biome, you’ve got an area where there are
living things and nonliving things that are interacting so in an example of an
ecosystem is something like a coral reef right you’ve got all your anemones
you’ve got your fish you’ve got all those zooplankton and phytoplankton
swimming around and they’re absorbing sunlight even though it’s not living is
still part of the ecosystem right things like sunlight things like water things
like air those are all interacting with the living things to give rise to the
ecosystem So it’s both the living and the non-living things right now going down even fruther, we’ve got communities now the difference between a community
and ecosystem is that this community is limited to only living things so in a
biology vocabulary community means basically two or more species
interacting you see this theme interaction right all these interactions
so this is basically when you study two or more species now you only have one
species that’s what we call a population right so the population is one species
now we’re building up right we go from one species a population to multiple
species community. Add some non-living things and you’ve got an ecosystem. with multiple different types of
ecosystems to get a biome and you keep going on right now the most common population
over here is of course the human population right seven building
something individuals now a population is made up of multiple individuals so
the step down of course is going to be individual, or what we call, an organism organism I’m an organism, you’re an organism
things like bacteria and plants those are also organisms right these are
living things now assuming that organism is multicellular it’s got more than one
cell now of course there are some types of life that are single-celled we call
those types of life unicellular some things like bacteria things like amoeba
those are unicellular but if we’re multicellular we go down to organ
systems so humans, me and you, have organ systems like our nervous system our skeletal system are the muscular system
all those organ systems believe it or not plants have organ
systems too if we show that this is the surface of the earth everything
below the surface of the earth is the root system of a plant is called the
shoot system now what’s next organ systems are made of a lot of different
types of organs so for example in order it might be a front while you’re
bringing or add this muscle right now we’re done my part is organ that’s part
of the cardiovascular system right my brain is part of the nervous system now
going down from organs we have tissues tissues these are not the tissues that
you sneeze in, all right these tissues in the biological sense are groups of
cells that have a similar function they do something similar so one example of a
tissue is what is called epithelial tissue epithelial tissue is
basically a group of specialized cells that help to line our organs so for
example epithelial tissue is found on my skin right the skin organ it’s part of
the integumentary system and is composed of epithelial tissue now as I said tissues are groups of cells, so what’s next we’ve got of course your cells your
cell we’ve all heard this before, cells cells are
the basic building blocks of all life if you’re living your made of cells
simple as that. Now cells can be decomposed further into what’s called
organelles organelles now notice something similar right you’ve got organs and you’ve got organelles here now
you can think of organelles as basically small organ sets that’s what they are
they’re organs of the cells so these organelles are things like the
nucleus things like the mitochondria things like peroxisomes those are all
organelles and they do things they have special functions in the cells to allow
them to do their job right now what’s next to organelles well they
are just basically a bunch of molecules together right molecules molecules are
made out of atoms atoms and atoms are made out of things like electrons and
protons and neutrons but you can see how we’re making this entire hierarchy using
just these simple atom can build things up right it’s a way to subdivide the
disciplines of biology so for example if you’re a biochemist biochemistry studies
biology at a level theory of molecules right how do different molecules
interact to give rise to functions if you were say a microbiologist you’re
good with things like microscopes you can look at things like organelles
themselves and tissues under those microscopes to see what they do right
now if you are say an anatomist or a physiologist you’ll be looking at entire
organs or maybe tissues organs or organ systems to see how they work
together to give rise to the organism right now if you would look at multiple
organisms together and see how population levels rise and fall that
would be at the level population biology and if you were to
look at how different populations interact for example a wolf in a deer
population predation right that would be has a level of community biology of
course you’ve got your ecologists and they’re concerned about how the living
things and about living things interact if you were to take some part of that
interaction out and what might befall the system ecology and of course we go
all the way up so I hope this general overview of biology helped you guys hope
you guys learned something and if you have any questions comments please feel
free to leave them down below

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