Animal sources of iron are bioavailable than plant sources of iron.

The correct answer filling term would be - "more".

Explanation:

Bioavailable is a term in pharmacology which means that how much some nutrient or drug is easily absorbed by the body. Iron is a nutrient that is essential for the body for several cellular functions. Iron can be divided into two types heme and non-heme. Heme is the form of iron that is easily absorbed by the body and only found in animal-based food such as meat, egg or poultry products.

Plant sources of iron are non-heme and not well absorbed by the body, this is one of the reasons that makes animal source iron more bioavailable than plant sources of iron.

Thus, the correct answer is - "more".

answer: c.

explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.