Tim wants to study how air currents affect weather patterns around the Earth. During his study, he makes several assumptions based on accepted scientific knowledge, including the Earth is round;
warm air rises over cooler air;
the Sun is the main source of energy for many Earth processes.
Is it acceptable for Tim to make these assumptions during his investigation?

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

the answer would be..

b. sucking

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.