Answer:
Explanation:
Haploid Cells
Haploid cells contain only one set of chromosomes. Gametes or sex cells are the most common type of haploid cells. They are produced by meiosis and are genetically diverse. When the haploid cells from male and female fuse together during fertilization, it forms a diploid cell.
Diploid Cells
These cells have two sets of chromosomes. It is formed by the fusion of two haploid cells. Most mammals are diploid, i.e., they have two homologous copies of each chromosome in the cells. They are produced by mitosis. The somatic cells in humans are diploid cells.
Answer and Explanation:
Tracheophyte plants, also known as vascular plants, are those that possess a supportive tissue that can also conduct fluids -The Xileme- and another tissue that conducts nutritious elements produced by photosynthesis -The Phloem-. These plants have a root (basically underground), a stem (aerial), and leaves. All of them together form the corm. And the corm counts with these vascular tissues to which we referred before.
There are different types of Tracheophyte plants, some of them produce seeds to reproduce and disperse -Spermatophyta- and some others reproduce and disperse by spores -Pteridophyta-. This last seedless group corresponds to ferns and other similar plants.
Pteridophytes characterizes for having a sporophyte that has stems with leaves and a root. It also has primitive xylem composed by tracheids and phloem, both of them formed by vascular bundles located in a central cylinder.
Spores are its dispersion units and are responsible for colonizing new areas. They also constitute the resistance units under extremely unfavorable conditions.
Their life cycle is composed of the asexual phase (sporophytic phase) and the sexual phase (gametophytic).
- The <u>sporophyte</u>, the dominant asexual generation, it is a perennial and diploid structure. Its aerial part might disappear during unfavorable seasons, but it reappears during spring or summer. The sporophyte is in charge of asexual reproduction
- The<u> gametophyte</u>, instead, is and haploid structure, ephemeral and must be in the water for its survival, and for sexual reproduction to be successful. In the presence of water, masculine gametophyte -antherozoids- are released and they swim to the archegonium to meet the ovocell. Antherozoids can swim because they have flagella. After fertilization, a new sporophyte is produced.
Answer: The removal of rock particles by wind, water, ice, or gravity. Works with weathering to continuously wear down and carry away rocks at Earth's surface.
Answer:
parasitism,
Explanation:
parasitism, relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism.
<span>Cell division has two checkpoints namely, G1 checkpoint and spindle assembly checkpoint. The checkpoint which determines if division has properly occurred is the G1 checkpoint. At this point, is a damage in the DNA is detected or the has not reach the optimum size, the cell is stopped in G1 and is not allowed to proceed to further process.</span>
