The answer is escucha.
The subject here is Marta, and we have to conjugate the verb to match the subject, which is a 'she' and you just add 'a' to the stem.
Answer:
La zoología y la botánica son partes de la BIOLOGÍA.
answers:
HORIZONTAL:
1. apagamos
2. césped
3. abrimos
4.
5. apagan
6. ducha
7. aspiradora
VERTICAL
8.
9.
10. ordenan
11. sacudes
12.
13. abres
14. corto
i dont know if theyre right or not :(, im sorry, but these are the ones i could do and made more sense to me :/.
hope this helps a little! :).