What do the atoms of elements in the same group have in common?
a. they have the same atomic numbers.

b. they have the same average atomic masses.

c. they have the same number of electron shells.

d. they have the same number of electrons in their outermost shells.

Option (D).

Explanation:

The modern periodic table is used to study the physical and chemical properties of each element. The modern periodic table shows periodicity in the elements.

The study of the element can be done down the group and along the period. As we go down the group in the periodic table, the number of valance shell increases by one unit but the number of electron in the outermost shell remains same.

Thus, the correct answer is option (D).

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)