Q: Each new horizontal row of the periodic table corresponds to the beginning of a new period because a new principal energy level is being filled with what? Read this paragraph and choose the correct option from the provided answers: When ordered by atomic number, the discrepancies within Mendeleev's table disappeared. Tellurium has an atomic number of 52, while iodine has an atomic number of 53. So even though tellurium does indeed have a greater atomic mass than iodine, it is properly placed before iodine in the periodic table. Mendeleev and Moseley are credited with being most responsible for the modern periodic law : When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties. The result is the periodic table as we know it today. Each new horizontal row of the periodic table corresponds to the beginning of a new period because a new principal energy level is being filled with electrons. Elements with similar chemical properties appear at regular intervals, within the vertical columns called groups . Choices: - protons - photons - neutrons - electrons A:
electrons

Q: What does the thymus gland produce? Read this paragraph and choose the correct option from the provided answers: Organs of the lymphatic system include the tonsils, thymus gland and spleen. The thymus gland produces T cells or T-lymphocytes (see below) and the spleen and tonsils help in fighting infections. The spleen's main function is to filter the blood. The spleen also detects viruses and bacteria and triggers the release of pathogen fighting cells. Choices: - b cells - insulin - hormones - t cells A:
t cells

Q: Q: Vertebrates are a subphylum of what phylum? Read this paragraph and choose the correct option from the provided answers: Vertebrates are a subphylum of the phylum Chordata. Like all chordates, vertebrates have a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. What other characteristics do vertebrates have? What traits set them apart from invertebrate chordates?. Choices: - arthropoda - hydrozoa - porifera - chordata A:
A: chordata

Question: Q: The heart, blood vessels, and blood make up which system in the body? Read this paragraph and choose the correct option from the provided answers: The cardiovascular system is made up of the heart, the blood vessels, and the blood. Choices: - digestive - pulminary - respiratory - cardiovascular A:
Answer: cardiovascular

*Question*
Q: A flow of one coulomb per second is called one ampere, which is a measure of what? Read this paragraph and choose the correct option from the provided answers: The electric current is measured in coulombs per second. A flow of one coulomb per second is called one ampere, A, of current. Choices: - Direct current - powered current - performance current - electric current A:
**Answer**
electric current

(Q).
Q: In what part of the carbon cycle does carbon move between living things and the air? Read this paragraph and choose the correct option from the provided answers: Carbon moves through ecosystems in two cycles that overlap. In the biotic cycle, it moves between living things and the air. In the abiotic cycle, it moves between the air, ground, and oceans. By burning fossil fuels, humans have increased the amount of carbon dioxide in the air. Choices: - endothermic cycle - envelop cycle - abdaspac cycle - biotic cycle A:
(A).
biotic cycle