Pollen tubes are produced by the male gametophytes of seed plants. They act as conduits to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms
Answer:
Explanation:
The epithelial tissues have a role that covers the inner lining of the organs of the body and also covers the outer surface of the body and lining of digestive system. If the body lacks the epithelial tissues then the microbes will invade the body and will cause diseases. The food and other foreign particles will harm the inner lining of the digestive system. This will result in internal leakage.
Answer:
Human impacts on marine ecosystems. Human activities affect marine ecosystems as a result of pollution, overfishing, the introduction of invasive species,and acidification, which all impact on the marine food web and may lead to largely unknown consequences for the biodiversity and survival of marine life forms.
Answer:
the salivary glands and the pancreas.
Explanation:
hope this helps
plz mark brainliest if correct
