Para sa bilang 21-30, isulat ang pang-uring ginamit sa pangungusap at tukuyin kung ito ay lantay, pahambing • pasukdol.
21-22. Totoong kaakit-akit ang tanawin sa El Nido, Palawan.
23-24. Kalmado ang dagat sa isla kaya ligtas ang mga turistang maglalakbay rito.
25-26. kasingganda ng Batanes ang El Nido, Palawan.
27-28. Malinaw at malinis ang mga tubig-dagat na makikita sa Batanes
29-30. Isang payapa ang lalawigan ng Batanes​

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

whose power in the senate is equal to the power of the speaker of the house?

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.