D. an internal shell, not sure might be wrong but it might be C. bilateral symmetry
Water enters a plant from the roots absorbing the water from the soil.
hope this helps !
Answer:
A. Predation
B. Competition
C. Limited Resources
Explanation:
ABC are negative factors so they can lead to natural selection. D is a positive factor that will not lead to natural selection.
Answer: Energy Source
Explanation:
An electric force field is provided by an energy source such a cell or a battery. A potential difference is created when a conducting wire is connected across the two terminals of the battery. This creates an electric force field which pushes the electrons from one towards the another. The flow of electrons constitutes an electric current.
The laboratory equipment to be used are the balance and a beaker whose size depends on the volume of the unknown).
First, the mass of the empty container then pour in all the liquid and read off the mass.
Subtract the mass of the empty container from the total mass.