Question

in what ways internal parasites like worms and flukes and external parasites cause harm to the cattle's

Answer 1

Internal parasite like liver fluke is the parasite of sheep it a digenetic parasite it causes disease in sheep and also human.
External parasite takes their food from cattles and they harms the cattles.

Answer 2

Explanation:

internal parasites harm the catle as they go inside the castles liver and damage it fully