That the oxygen levels in the test tube increased and carbon dioxide levels decreased because plants produce oxygen using carbon dioxide
Answer:
a. two plant species flowering at different times.
Explanation:
<em>The only option that is not a post-zygotic reproductive isolation mechanism would be option a, when two plant species flower at different times.</em>
Post-zygotic reproductive isolation mechanisms are those mechanisms that act to ensure that the product of fertilization remains invalid. This is as opposed to pre-zygotic isolation mechanisms that act to prevent fertilization and hence, formation of zygotes.
In option b, c, d and e; the zygote has been formed already and all the forces are just acting to ensure that it remains invalid. whereas in option a, there is no fertilization yet.
<u>Two plant species flowering at different times will ensure that there is no cross pollination between the two species. Without pollination, there cannot be a zygote formation.</u>
Hence, the correct option is a.
<span>The process of sedimentation is defined by the process by which the materials transported by different agents run off, glaciers, the wind and coming from the erosion and weathering of the rocks are deposited, becoming sediments. Carrying out the process of formation of the different rocks this process goes hand in hand with erosion</span>
TAG GGC TAT GTC CAT AGC AAT
TAA CRA TGG GAT AGC TTG AGT
