1. Arteries : Carry's blood away from the heart.
2. Veins : Carry's blood back to the heart.
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3. Capillaries : exchange of materials and gases between the cell and vessel takes place here.</span>
Pollen tube growth is one of the most fascinating—and essential—phenomena in the life cycle of flowering plants. After a compatible interaction between pollen grains and the stigma surface, the pollen germinates and forms the pollen tube, which grows through the stigma, style, and transmitting tract to deliver the sperm cells to the ovule."
2) Although pollens of many species germinate in simple aqueous media, stigmas do not provide satisfactory sites for the germination of most foreign pollen... Stigmas not only provide the proper conditions for the germination of pollen from their particular species, they actively inhibit the germination of pollen of many unrelated species.
Answer:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat.
Explanation:
When the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
<span>there are several differences, here are some:
kingdoms: sunflower = plant; amoeba = ProtistaCell
membranes: sunflower = cell wall; amoeba = semipermeable membrane only
organelles: sunflower = cholorplasts; amoeba = pseudopod
</span><span>Cell organization: sunflower = differentiated multicellular: amoeba = single cell
<span>Habitat: sunflower = confined to land areas; amoeba = confined to water
hope this helps</span></span>
