Answer:
Explanation:
In the upper thermosphere, atomic oxygen (O), atomic nitrogen (N), and helium (He) are the main components of air.
Answer:
the melting of glaciers and polar ice caps
and
the flooding of low-lying coastal areas
Explanation:
B. Lycophyte sporophyte
Explanation:
Lycophytes belong to the division Lycophyta under Pteridophyta. Lycophytes are group of seedless vascular plants.
The living lycophytes are representatives of a plant group that were dominant during the carboniferous period. The extinct groups of lycophytes were mostly tree like tall and large e.g. <em>Lepidodendron</em>
However, the modern day lycophytes are small and herbaceous. They show alternation of generation with the sporophyte being the dominant phase. The leaves are small and simple with an unbranched midrib,these are called microphylls.
The reproduction in lycophytes takes place through spores which are produced inside a sporangia. Specialized leaf like structures called sporophyll bear the sporangia. These sporophylls may or may not be present at the terminal ends of branches and are arranged into definite strobili.
Keeping all these features in mind and comparing the characters of the plant found by the student, we can conclude that the plant is more likely to be a lycophyte sporophyte.
I believe the answer is b. gene flow
The heart is contracting . Diastolic is when the heart is relaxing.