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science one

Across
the time taken for the radioactivity of a specified isotope to fall to half its original value.
The positive part of an atom
Blood is take from the heart through these vessels
This is the process that plants make food
The galaxy that our solar system is contained
The genus and species of a human being
is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration (change of velocity) when a net force is applied
Blood is brought back to the heart by these vessels
The items that are included on the periodical table
interaction between two different organisms living in close physical association, typically to the advantage of both. a mutually beneficial relationship between different people or groups.
Down
The most abundant element in the universe
The negative portion of an atom
the genetic makeup of a particular organism
The neutral portion of an atom
a protein that produces an immune response
the fatty network of connective tissue that fills the cavities of bones, where red blood cells are made.
These blood vessels surround muscles and allow for oxygen to escape
This gives a plant cell shape and is ridge rather then permeable has in a human cell
a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation. Some call it an educated guess.
a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum.
The first classification of living things