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dybincka [34]
3 years ago
10

The spheroidal stage of early prenatal development with about 16 to 64 cells is called a(n) __________.

Biology
1 answer:
SCORPION-xisa [38]3 years ago
3 0
Blastula --> early embryo with spherical shape if cells before gastrulation into germ layers
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A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches. C
LUCKY_DIMON [66]

Answer:

A) With the closer spacing for the rows, the growing  corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation.

Explanation:

If the space among plants is less, the shadow that they are going to produce is going to reduce the need of water, so they production will rise and the cost to maintain the crops will be less, so the producer can double the profits.

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Apple maggots are a type of fly native to North America. Prior to the introduction of the apple tree to North America, apple mag
scoundrel [369]

Answer:

B

Explanation:

B is the most likely consequence because of the following facts we are told:

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This provides a geographical isolation (because they are feeding and laying eggs on separate trees) and reproductive isolation (because they will only mate on the type of tree on which they are born).

These two factors increase the chances that apple maggots feeding on apple trees will only encounter those who have mated on the same tree, and continue to mate this way. Over time, the populations (i.e. apple tree vs hawthorn tree) will intermix less and less. This will mean the genetic pool will become distinct, and natural selection will be acting differently (different habitats and different genes), encouraging speciation.

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3 years ago
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What contains all the oxygen and carbon dioxide surrounding earth
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Thus, atmosphere contains the most whole of oxygen and carbon dioxide

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Pb has an atomic mass of 82. If an atom of that element has an atomic mass of 80, that atom is known as: an isotope.

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