Answer:
In primary succession newly exposed or newly formed rock is colonized by living things for the first time.In secondary succession an area previously occupied by living things is occupied by living things is distributed-disrupted-than recolonized following the disturbance
example is eruption of volcanoes, the big island of hawaii. As lava flows into the ocean,new rock is formed
The human population has grown more and more quickly over time since the development of agriculture.
Option (a);
<u>EXPLANATION:</u>
- The growth in agriculture allowed an increase in population over time.
- Agriculture developed with more irrigation facilities and farming machines.
- So, more food could be grown and was available round the year for the
- people to consume.
- With urbanization, food could be transported well across the places.
- A smaller number of people died due to starvation. People settled in towns and cities to do farming.
- Thus, with the overall development of agriculture eventually, health and nutrition improved which led to an increase in population.
Answer:
DNA content is halved in both meioses I and meiosis II. Ploidy level changes from diploid to haploid only in meiosis II.
Explanation:
In meiosis, one diploid cell produces four haploid cells. At the end of meiosis I, just like in mitosis, we will have two diploid daughter cells and then these two cells undergo cellular division again. In this secondary division, more precisely in the anaphase II, the centromere divides <u>(this process does not happen in the meiosis I anaphase I, where homologous chromosomes move together to opposite poles)</u> and sister chromatids move to opposite poles, leaving four individual cromatids following a cytoplasmatic division forming four new haploid cells.
The answer is C because all plants have vacuoles and only some animals do have them too
