When planning space exploration, scientists face many challenges. One issue is the weight of the items being transported. They c
an use the engineering design process to help minimize the weight of materials on board a spacecraft The engineering design process starts with a statement of the problem to be solved. Which sentence best states the problem described above? A. Space vessels must carry heavy equipment but also minimize weight O B. Lower gravity on the Moon means that objects weigh less on the Moon than on Earth. O C. The longer a space flight will last, the more equipment must be carried D. Metal is stronger than plastic, but it is also much heavier,
T cells. When HIV arrives in the lymph nodes – around 24 to 48 hours after exposure – they activate other immune cells, such as CD4 t-cells, HIV's primary target.
