Gg x Gg g

G
GG
Gg
g
Gg
gg
The Punnett square above shows a cross between two plants. Both plants were heterozygous for dark green leaves (G)
and carry the recessive trait for light green leaves (g). In this cross, 50% of the offspring will be

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

trachea, alveoli, lung capillaries, arteries