1: Synonym of 'alert'

4: They often act as enclosures for animals at the zoo.

6: Not in physical motion.

7: Dinosaurs that ate both plants and meat.

9: Opposite of drab

12: A large tree is the Douglas ______.

13: Past tense of 'save.'

16: Plural form of 'tell.'

17: 'I made this card ______ you Lisa.'

18: In terms of lives lost and destruction, it was the most devastating war in human history.

21: Synonym of 'hard' or 'tough.'

22: Acquire or gain knowledge or skills.

23: A structure in the heart with a flap to insure one-way flow of blood through it.

24: A line that divides two adjacent river systems.

1: A fertile or green spot in a waste or desert, especially in a sandy desert.

2: Opposite of frown

3: Opposite of unrelated

4: Little Joey left a mess where ever he walked, as he was ______ in mud.

5: An animal with a very long neck.

8: Of great consequence.

10: On a topographic map, ______ lines show elevation.

11: Get to know or become aware of; 'I just ______ that she has two cats.'

13: Filled with something.

14: Opposite of careless

15: Write differently; alter the writing of.

16: An advertisement consisting of short scenes from a motion picture that will appear in the near future.

19: Opposite of learn

20: To have had ownership or possession of something.