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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 is a virus?
Yazi Reply
They are Akaryotes,they are made up of nucleoprotien particle.They are composed. of DNA and RNA
Nana
what is cell
Sulayman
describe the evolutionary history of birds
Mable Reply
synchondrosis and symphyses are?
Mable
synchondroses and symphyses are?
Mable
Describe how manuals digest (1) starch (2) proteins
Isaac Reply
what is biodiversity
Amos Reply
different living forms on earth
kanchan
is simply the variation in all forms of life
Nana
different types of plants,animals,fungi and other microorganisms..all constitute biological diversity
kanchan
What is the hardesr bone in our body
Rowena Reply
right and left femur
Mehtab
leg bone
Agbesi
Thigh bone
kanchan
skull
Nana
thigh bone
Desery
femur
Faith
femur
Amos
femur
Mable
What is diffusion?
Ronke Reply
The movement of particles from the region of high concentration to the region of low concentration.
Saim
Can osmosis occur in a liquid?
Ronke
yes, osmosis occur mostly in liquid while diffusion mostly in gases
Faith
Thanks😉
Ronke
What is an isotopic solution?
Ronke
I mean isotonic i
Ronke
diffusion is the movement of molecules from a region of high concentration to a region of low concentration
Yazi
Explain the processes of digestion and absorption
Keyard Reply
I believe the compounds and layers of nutrients is processed through a two to four way channel , ' The feed, the composing infringed bashingment compelling distinguished despret hault 'it fills the peak before the in richment of the boiling acids there of digestion reaping an absorption either .
Heidi
.
Nicole
What is the function of palisade bundle .
Daniel Reply
the reproductive system of awoman
Mwakwe Reply
what is a nucleotide
Nowamani Reply
A compound consisting of a nucloside linked to a phosphate group
Peace
is the building block for DNA and RNA
Yazi
What are the functions of the cell
Peace Reply
they perform some specific function in the cell eg.Reproduction
Nana
And are also the building blocks of the body
Nana
what is meant by the term anatomy
Sande Reply
anatomy means the studying of the different part of any organized body to discover their situation
Naasah
what are cells
Alier Reply
cells are the basic functional unit of life
Eric
cells are the basic unit of life
HAMIDAH
Cells are the building block of all living beings
Peace
the basic unit of living organisms
Yazi
the study of living organisms
Dorcas Reply
is biology
Yazi
what is body symmetry
Elizabeth Reply
body symmetry is dividing an organism to obtain equal halves
Eric
What is organ
Samuel
organ is a group of tissues which perform a specific function
Eric
organ are group of tissues that perform a specific function.
Nana
some organs are the lungs,heart etc.
Nana

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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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