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vagabundo [1.1K]
3 years ago
14

There are a total of ______ state(s) of matter. a. 1 b. 2 c. 3 d. 4

Biology
1 answer:
Lilit [14]3 years ago
7 0
There are 4 states of matter : plasma, liquid, gas and solid.  
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True vertebrates have a true head that develops from a neural crest of cells and hard structures surrounding the notochord.
Bond [772]

Yes. True vertebrates have a true head that develops from a neural crest of cells and hard structures surrounding the notochord.

The neural crest, which forms early in the development process in vertebrate embryos, is a fold on the neural plate where the neural and epidermal ectoderms converge. As an embryo grows, the neural crest produces neural crest cells (NCCs), which can differentiate into a variety of different cell types and contribute to tissues and organs.

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7 0
1 year ago
What three (3) factors determine the reactivity of elements? Explain and give examples of each.
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Three factors that determine the reactivity of elements are the valence electrons are the electrons in the outermost electron shell of an atom. The number of electrons in an atom's outermost valence shell governs its bonding behaviour. That is why in periodic table the elements were put together according to their numbers of valence electrons.

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An atom in Group 1 has only one valence electron.

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A nonmetal tends to attract another valence electrons to attain a full valence shell.

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