Answer:
D
Explanation:
A tectonic plate boundary, as the name intuitively suggests, is the boundary between two tectonic plates. A tectonic plate boundary can be a convergent boundary or a divergent boundary. Convergent boundaries are hotspots for earthquakes because of the occasional stress release (as energy) as the tectonic plates collide. Towns & cities close to these boundaries are highly prone to destruction by earthquakes and tsunamis.
The correct answer is c.all carriers of sex-linked disorders are females who do not express the disorder.<span />
Theory of spontaneous generation
Explanation: Theory of spontaneous generation stated, life arose from non-living things. Pasteur disprove this theory by S-shaped tube experiment. He used swan-neck flasks (twisted necks) and filled them with sterilized beef broth
Answer:
Diploid microspore mother cells divide by meiosis to form four haploid microspores. Each microspore develops into a pollen grain by mitosis.
Explanation:
Pollen grains contain the male gametes of a sexually reproducing plant. Pollen grains are haploid cells in nature produced by the meiotic division of microspore mother cells (located in the anther). The meiosis of these diploid (2n) microspore mother cells give rise to four haploid microspores. This process in plants is called microsporogenesis.
Each haploid microspore (n) develops into pollen grain called microgametophye (bearing male gamete) via mitotic division. During the pollen grain formation, a wall is formed around the microspores.
