Answer:
The correct answers are the second and the fifth statements.
Explanation:
The non-native species are introduced in the community either as a consequence of human activity or because of natural range extensions. The majority of the non-native species exhibit deleterious ecological effects and are considered as invasive species. Almost all the ecosystems are at threat due to the deleterious effects of the introduced invasive species.
The non-native species are the prime threat to the surroundings as they can modify habitats and change the ecosystem services and function, and may replace or crowd-out the local species. The non-native species are considered as the second-ranked major threat to biodiversity after habitat destruction like deforestation.
These species threaten biodiversity as they can grow rapidly and can act as parasites or predators against the native species and do not possess any kind of natural predators so that the growth of the introduced species can be monitored. These species can act as competitors, as they compete with the local species for the resources available.
Flatworm get most of their oxygen through diffusion.
Answer:
haploid cells!
Explanation:
most body cells go through mitosis, which produces a cell exactly identical to the original cell.
what makes meiosis / sexual reproduction unique, is that they use zygotes. the male zygote (sperm) and female zygote (oocyte) go through mitosis TWICE so that they end up with half the number of things they need. When the oocyte and sperm combine during reproduction, the new cell will have a unique HALF from mom and a unique HALF from dad to make a whole unique cell!
Answer:
The given statement is true
Explanation:
Watersheds are area that drains the rainwater and streams to a common vent, like- mouth of a bay, reservoir outflow etc. It is also regarded as a drainage basin. It includes- lake, reservoir, stream, groundwater etc.
A large watershed contains in it many small watersheds depending on their outlet. For example- the Mississippi Water Basin. The continent of America is divided by two water sheds, one which has an outlet in Atlantic Ocean and the other has in the Pacific Ocean.
Thus the above mentioned is true for watersheds.
When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.