Embryological evidence
Explanation:
Deuterostomes include echinoderms, hemichordates, and chordates. Despite their diverse body structures, they all feature a mouth that forms secondarily during embryonic development, thought to be a derived evolutionary trait connecting a common ancestor to all its descendants (a synapomorphy). This mouth originates from the ectoderm layer through invagination opposite the blastopore in the gastrula.
Answer: Enzymes reduce the activation energy associated with food molecules
Explanation:
Chemical entities such as yams, potatoes, eggs, etc., consist of elements linked together by chemical bonds like hydrogen bonds and covalent bonds.
To facilitate digestion, these bonds must be disrupted in order to convert carbohydrates into glucose and proteins into amino acids.
Therefore, when enzymes are introduced, they lower the bond strengths or activation energies by positioning them appropriately in their active sites, designed to cleave specific bonds.
As a result, digestive processes become faster in the presence of enzymes compared to without them.
Answer:
Options B, C, and D
Explanation:
The following assertions are accurate about the continental crust:
Its thickness ranges from 25 to 70 km.
It comprises various kinds of rocks.
This layer contains silicate minerals rich in sodium, potassium, aluminum, and calcium.
Answer:
1. The boy detected an unpleasant odor from the packet that was left out on the table, caused by rancidity.
2. The packet stored in the refrigerator remained odor-free because it was not exposed to air.
Explanation:
Rancidity occurs when fats and oils undergo oxidation, leading to a change in their smell and flavor.
Exposure of food items to oxygen results in oxidation, which produces unpleasant smells and tastes.
