Oaks and many other trees are monoecious.
It refers to both when the male and girl reproductive organs are gift within the identical organisms or vegetation. Dioecious plant life. it is stated whilst the male and lady reproductive organs are distinct, this means that they're present in two separate organisms or plants.
Vegetation that have both woman and male sexual organs on the equal plant are known as monoecious plants. those male and woman parts can be placed at unique locations at the plant. instance: Cucurbita, Chara, and Coconut.
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I believe the answer you're looking for is temperature and precipitation.
Climate is based on the amount of rainfall (i.e. a rainforest) or the temperature (i.e. a tropical climate)
The correct answer is - d. colder and denser.
The main differences between the surface currents and deeper currents are the temperature and density, and that actually decides their position in the water, on the surface, or deeper.
The surface currents are warmer, and because they are warmer the molecules are much more loose, so the density is lower, which in return makes it easier, thus it is in the surface.
The deeper currents are colder, and because they are colder the molecules are much closer and more concentrated, so the density is higher, which means that they are heavier, thus fall deeper below the easier currents.