Cell Transport Test (Test 3B HN) Which of the following is an example of active transport?Proteins moving ions from low to high concentrations across a cell membrane
Water diffusing throughout the cytoplasm of a cell
Chromosomes migrating during cell division
Cilia moving rapidly to propel a single-celled organism through water

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the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.