In human, Oogenesis in comparison to spermatogenesis is different in that Oogenesis does not complete meiosis until after fertilization, but spermatogenesis is complete before the sperm leave the body. Oogenesis is the process by which the female gametes, or ova are created in the female's ovary. Spermatogenesis is the process in which males synthesis sperms. The two process are part of gametogenesis which involves meiosis type of cell division, in which a diploid cell divides into four haploid daughter cells.
Answer:
A, C, D and E are correct.
Whales did evolve from hoofed land-dwelling mammal ancestor, Pakicetus.
The nostrils moved from the front to the top of head to help them breathe while most of their body is submerged in water. As whales became aquatic, they used their tail more and more and the hind limbs became useless and vestigial. The skull became elongated over time because this design helped them be more aerodynamic in water and helped them evolve echolocation.
Explanation:
B. is incorrect because whales are mammals too.
F. is incorrect because their bones became more dense to help them stay submerged.
Climate change and biodiversity are two completely different things. In some areas, climate change will increase biodiversity, allowing more species to live in certain climates, but it will make some species lose their habitats. Biodiversity helps ecosystems thrive, and generally keeps things in balance. However, introducing too many species in an area can cause increase competition for food, risking predators of different species to kill one another off. Both climate change and biodiversity can be good and bad.
Answer: C. It can help some species and hurt others.
