To living organisms, the most dangerous debris from tephra is volcanic ash, because it spreads so widely.
Answer:
The gametophyte generation is longest and largest phase
Explanation:
Bryophytes evolved from the algae group of the plants which were aquatic environment. The Chara algae which grow in the tidal region evolved to form the first plants which could grow in both water and land called bryophytes.
The bryophytes although obtained nutrition from the terrestrial environment but their gametophytic stage was dependent on the water for the fertilization.
The gametophyte which produces the gametes were larger and independent as compared to the sporophyte which was small. The gametophytes formed the dominant phase of the life cycle of the bryophytes.
Thus, The gametophyte generation is longest and largest phase is correct.
The second and fourth answer. :)
Answer:Warming of the Earth's climate and associated changes to oceans were the most likely causes of the extinctions. At the end of the Permian Period volcanic activity on a massive scale in what is now Siberia led to a huge outpouring of lava.
Explanation:
Answer:
An event can cause changes to occur in one or more of the spheres, and/or an event can be the effect of changes in one or more of Earth's four spheres. This two-way cause and effect relationship between an event and a sphere is called an interaction. Interactions also occur among the spheres.
