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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

how many cells on the human
Amar Reply
how is genetic testing?
Nyabuoy
test
Nyuongatdet
which party of an internal leaf which represent organ and tissue
fernando
3 trilleons cells on the human
Jyoti
who many cell are in the human body
Ayasso Reply
what causes coloring of skin variation
Prince Reply
what is your answer
Jonathan Reply
which qn
Randa
what is chemosynthesis
Irene
who many cell are in the human body
Ayasso
there are billion cells in human body
fazeela
what are three stages of mitosis
jerry
they're alot cells in our body
jerry
what are the stages of mitosis
jerry
they are prophez methaphez anaphez. thelophez
fazeela
anyone to explain each of the following,, prophase, metaphase, anaphase and telophase
jerry
what is a filial
Mbah Reply
what is the difference between chlorophyll and photosynthesis
Rahman Reply
Chloe is the green pigment found in green plants while photosynthesis is the process by which plant produce their own food
mary
photosynthesis is the production of food by plant while chlorophyll is the green pigment that is found in chloroplast..
jerry
chrolophyll (green colouring matter in leaves) while photosynthesis (process by which green plants make their own food)
Nakhombi
what are the functions of parts of microscope
Bami Reply
base to provide support
Ian
only base what about the other
Bami
has only one function
Mark
Mirror ... used to reflect light
Irene
outline 2 ideas of Darwinism theory
Fatma Reply
important of protein in plants
Mark Reply
Protein in plants- repair damaged tissues -
Danisha
what is science
Lizzicios Reply
science is a broad field of study.
Prince
enzyme
Mark
science (study of living en non-living things
Nakhombi
what is cell?
Mirembe Reply
what are antibiotics?
Mirembe
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Oscar
A cell is the smallest unit of a living thing or organ..
Gloria
Antibiotics are antibacteria's/medicine that inhibites the growth of or they destroy micro organisms in the body
Gloria
what are genotype
Abibatu Reply
what are the two types of twins
Fraza Reply
what are osteocytes
Fowowe Reply
WHAT ARE NOBEL GASES
Mbasa Reply
Noble gases are the ones that have octet electron arrangements therefore they are very stable and does not need any more electrons.
Danisha
hey there
Izoo
What is boi
Prince

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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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