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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

phenotype is your big head
Amagiya Reply
The phenotype is the physical appearance or things you can see. Or the traits expressed by ones DNA.
Eric
what is a dichotomous key
Moses Reply
explain the role of
Moses
Dichotomous key : Is the key that is use to classify or group an organism base on their common features
Alale
an amoeba is what kind of cellular organism?
Mercy Reply
It is a protizoa with bilayer membrane bound organelles. Therefore it is eukaryotic.
Eric
what is amoeba
Muhammad
amoeba is a unicellular organisms. Therefore it is made u of only one call.
Alale
what is phenotype
Muhammad
name ten equipments found in soil science laboratory and their uses
AFANU Reply
daigram of connective tissue
Yunusa Reply
what is polarization
Finda Reply
What is appendicular
GLORIA Reply
relating to or denoting an appendage or appendages.
Eric
Homeostasis definition
Ben Reply
can be defined as a steady of internal environment
Aliyu
MMMM!!!
Kaole
🙄
Aliyu
:-)
Kaole
wat is active transport
Roster Reply
The movement of molecules from the region of lower concentration to the region of higher concentration
gerard
what are derived quantities
Esther Reply
Derived quantities are quantities that are calculated from two or more measurements. Derived quantities cannot be measured directly. They can only be computed.
Stanley
name two types of acid
Grace Reply
Hydrochloric acid and tetraoxoshulphate(VI) acid
Mercy
melic acid and aspartic acid
dilip
sulphuric acid, hydrochloride acid
Greig
describe the effect of smoking on the respiratory surface
Castro Reply
Tar which causes lung cancer
Castro
what is osmosis
Tinashe Reply
explanation of osmosis
Finda
movement of water particles from a region of high concentration to a region of low concentration across a semi permeable membrane
Moses
movement ofwater particle from aregion
Moses
what is respiration
Favour Reply
organisms and their respiratory organs
Favour
Osmosis.. An example of Osmosis is when red blood cells, which have a high concentration of protein and salt, are plaeed in a lower concentration fluid like water the water will rush into the red blood cells.
boafo Reply
You're asked for the Definition, not yet an example. Definition first,before example, o.k?
Tseyina
osimosis is the movement of watermolecules from they region of high concetration to the region of lower concertation
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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