Answer: C. 1.8
Steps:
25x = 45
x = 45/25
x = 1.8
Mechanical digestion takes place in the mouth
Invertebrate doesn't posses "Backbone" whereas Vertebrate chordate have that. That's the only & most important difference between them.
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The primary source of stem thickening in plants is the vascular cambium. It is a plant tissue located between the phloem and the xylem and in the root of a vascular plant. It is the source of secondary growth or the radial growth of the stem of a plant.
The frogs can get hurt by jumping to the feet