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Photo depicts Earth from space.
This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Questions & Answers

what does the letters DNA stand for?
Princess Reply
desoxyribonucleic acid
MissMeriiit
It simply means 'decoy ribonucleic acid'
Mustapha
sorry ... deoxyribonucleic acid...
Mustapha
what are some functions of the DNA
Seth Reply
What is biodiversity
Chati Reply
the diversity of plants and animals life in a particula habitat
Harry
Biodiversity is the variety of organisms in their common groups
Osei
what is glycolisis
David Reply
glycolisis is the breakdown of glucose
Yazi
the answer is incomplete the breakdown of glucose to what
David
what is biodiversity?
Hope Reply
What is biodiversity
Chati
what is taxonomy
Patience Reply
Taxonomy is a branch of biology that deals with the description, identification, nomenclature, and classification of organisms
Farco
what is nomenclature
John
nomenclature is the scientific naming of organisms
Bigenis
state the structural differences between the termites
Massa
what causes the DNA results of an offspring
venius Reply
how are proteins digested?
Trox Reply
how are proteins digested
Kaka
guys what is locomotion?
Misheal Reply
what is anatomy
Mohamed Reply
no idea
Benard
Anatomy is the branch of science that deals with the study of internal and external structures of an organism
Bigenis
Anatomy is the branch of science that deals with the study of the internal structure of an organism
Nana
what is locomotion?
Misheal
no idea
John
Locomotion may simply mean the movement of an organism from one point to another without permanent displacement of the organidm it'self
Bigenis
simply, its the ability to move
MissMeriiit
Thanks guys
Misheal
I have gotten it
Dickens
locomotion as an art student is the ability to move from on place to another
John
muscles that are concerned with locomotion
John
Anatomy deals with the study of internal structures of an organism
Osei
The ability of cells or organisms to move and propel itself from place to place. supplement. locomotion in biology pertains to the various movements of organisms (single-celled or multicellular organisms) to propel themselves from one place to another.
garnhial
Anatomy is the branch of biology concerned with structure of organisms and their parts. Anatomy is a branch of natural science which deals with the structure organization of living things - human anatomy is one of the essential basic sciences that are applied in medicine
garnhial
what is multicellular organisms
Massa
multicellular organisms these are living things which have more than one cell
John
what are the theory if cells
Julius Reply
What's the function of epiglottis
Ugo Reply
What Is The Other Name For Intestinal Juice?
Justin Reply
what is the largestest planet of the universe
rick Reply
what are the types of cell
Bernard Reply
prokaryotic and eukaryotic
Yazi
prokaryotic cell and eukaryotic cell
Grace

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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