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  • Hello, students of science! Let's talk about the characteristics of life. Your

  • target is being able to explain the characteristics of life and why we need them.

  • And why we need them is, more or less, to be able to tell whether or not something is alive.

  • You'd think that'd be a pretty easy question, but when we get to some of our later

  • topics, you'll see, it's not actually. First up, all life that we are aware of is made

  • out of cells. Cells are the smallest living things. Of course there are things

  • that are smaller than cells (like atoms and molecules), but those things are

  • aren't alive. Here we have something like single-cell bacteria, these unicellular

  • little creatures that you'll find in pond water. They are small and there

  • are, of course, made of things that are smaller, but those things that they're

  • made of? Not actually alive. Here we can see this is the head of the pin and these

  • are just a few cells, anywhere between 10 to 12. Those tiny, tiny, tiny cells might grow

  • up to be an incredibly large organism, but this one here definitely

  • multicellular. Next up, reproduction. More or less, that means making more organisms.

  • We got two different types of reproduction. We've got sexual

  • reproduction (that's with a partner). This is the, uhm, most school friendly picture I

  • intend on showing you about sexual reproduction. Here is a frog who is... nnnnnnot

  • interested in sexually reproducing with that frog. Then we've got asexual

  • reproduction. More or less, that's without a partner. Simply put, that's just the cell

  • kinda splitting in half. Sometimes that's called binary fission. Next up, a

  • genetic code. Genetic code is information, a recipe for how we make an organism. In humans, the one you're

  • probably familiar with (that we'll go into later) is, of course, DNA. Now right here, we

  • have a tiny, tiny organism. This is an embryonic animal. Hopefully, you can guess it.

  • (The ears are kind of a giveaway.) It's a baby elephant. Well, how does it know

  • to grow up from that tiny, tiny, tiny cell into an elephant? Its DNA told it. This beautifully complex

  • molecule there is composed of only four letters: A, C, T and G. So think of it as like a

  • typewriter with only four different keys, but in it, we can make with all of the diversity that is life.

  • Growth and development. Now, growing just means you're increasing in size. imagine

  • just bigger baby children they would pretty weird their heads are huge

  • relative to their body address growing is getting better

  • however a lot of organisms and it's not necessary that the head shrunk its at

  • the rest of the body

  • kind of caught up with that so developed to differentiate it just needs to change

  • your shape or change your structure bacteria is very simple unicellular

  • organisms they grow humans however developed bacteria just get bigger and

  • divide humans change in Cincy just the train in an embryo it doesn't just get

  • bigger you can see how to differentiate in coming forward and swarming all those

  • different structures that are in your brain

  • she Regency from birth to adulthood how the proportions drastically change you

  • know as we go from fertilized a side note to blastocysts you can see it's not

  • just getting bigger taxes Giants fears were drastically changing in shape as we

  • get older we do the spot near the stage at this amazing time I and you can see

  • dogs aren't just very large properties of course they're full grown but this is

  • an animal that's not just getting bigger it's also changing shape changing sides

  • changing structure certain parts that are getting larger so growth and

  • development next up tribalism metabolism more or less is eating and pooping it's

  • using materials and energy but not gonna show you and images that shocking videos

  • are out there even plant metabolism plants used the sun's energy to make

  • sure we can process that we know as photosynthesis and of course it does

  • come out the other end showing a little bit but not too bad they never one of

  • those for many reasons

  • matched up response organisms detect and respond to stimuli from their

  • environment did reviews rabbits deer playing a game of cops stopped short of

  • a pastor everything but as that one approaches you can see this one response

  • to changes in its environment and you know it even plants to the STU plants

  • will grow toward the white you may have seen something like that where there's

  • even a little plant out there told the most aware when you touch the waves at

  • her close-up it's responding to a change in its and why it's alive that's a

  • characteristic device

  • Metro you can see in the dark very very large vertical

  • like what happens you bring it out into bright light and that pupil of course

  • transcripts it's responding to a change in its environment

  • homeostasis time of the weird one here by the name your price for this trade

  • means that the internal environment is in a state the same you and your

  • temperature oxygen in your co2 levels inside your body are roughly doing

  • remain the same despite the large changes in the outside environment your

  • internal memory is dinner they stay the same it gets hot outside

  • you still stay 98.6 degrees it gets cold outside

  • you would still stay 98.6 degrees pH oxygen all those as well they are going

  • to remain the same even though the outside environment going to change a

  • lot and finally evolution as a group living things change over time we're not

  • talking any one organism just a silly sprout wings but we're seeing it as a

  • group things change over time

  • a population of organisms well as individuals will not

  • so let's take a look at a couple examples here which characteristic is

  • this year we have a cat that sat down on a head shot which characteristic is dat

  • well that's definite response it's responding to a painful change in its

  • environment but the betrayed look on its face right now but this one here

  • well thats metabolism you know I'm not I'm not sure what's coming out on the

  • other hand but remember metabolism is eating and pooping taking in materials

  • and using them for energy so there we have it

  • characteristics of life

Hello, students of science! Let's talk about the characteristics of life. Your

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B1 reproduction tiny environment metabolism organism responding

Characteristics of Life

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    Yrchinese posted on 2017/04/14
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