Answer:
The long development time can be risky for both the embryo and the mother.
Explanation: The long development time can be risky for both the embryo and the mother.
The first one is atoms cause they are all the same type of particles. The blue one is the molecules that is not compound cause they aren't connected to each other. The other two are compound cause two atoms of two different elements are bonded together.
On both the ocean floor and continental land
I think the answer is D. Circulatory because this system helps to get the absorbed nutrients throughout the whole body
