The growth of plant seedlings is usually A. phototropic and gravitropic
B. thigmotropic and gravitropic
C. phototropic and influenced by ethylene
D. gravitropic and influenced by ethylene

The correct answer is - A. phototropic and gravitropic.

Explanation:

A plant seedling grows usually two-direction shoots or stems towards light and roots towards the soil or in the direction of gravity. The movement of the plant toward a specific stimulus or effect parts is called tropism and different parts move in a different direction.

The movement of the roots of the plant is usually towards the direction of soil or gravity and this is called gravitropic. The shoot or stem grows from the seedling towards the direction of light and it is called phototropic.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

the circumference of the solar disc is 4375246 km, nearly.

explanation: