Only land animals can leave traces - the first animals were too big to preserve d question 4 0.34 pts an animel o must live on land o is a single-celled organism was the first form of life on the earth ois a prokaryote o has specialized cells d question 5 0.33 pts what was one evolutionary advantage that conifers had over seed ferns? greater tolerance to cold conifers are single-celled organisms ability to grow on land conifers have flowers and fruit ability to photosynthesize d | question 6 0.33 pts why are fossils from the beginning of the phanerozoic eon easier to find than fossils from the proterozoic eon? life on earth only appeared in the phanerozoic fossils can only happen to land animals, which only appeared in the phanerozoic no rocks from the protozeroic eon are currently present on earth there were only prokaryotes before the phanerozoic many organisms started to have skeletons, shells, rigid coats and other hard parts in the phanerozoic but not in the protozeroic question 7

What is the equilibrium constant of aa+bb=cc+dd

Quickly! brainliest if two people answer! 1. the blood has red blood cells, white blood cells and platelets. red blood cells carry oxygen to other cells in the body. cells need oxygen to live. white blood cells destroy certain germs. they protect our bodies from disease. which question is answered in this paragraph? (a) what is the role of blood vessels? (b) what type of cells are attached to bones? (c) what type of blood cell to clot your blood? (d) what are the different types of blood cells? 2. which sentence from the section "stem cells" best explains the role of stem cells? (a) when one kind of cell stops working, stem cells can . (b) they can turn into that cell and take its place. (c) scientists are studying new ways to use stem cells. (d) these cells can people heal faster. 3. read the selection from the section "nerve cells." nerve cells send messages to the rest of our bodies. these messages move between the brain, spinal cord and various organs. nerve cells are also called neurons. fill in the blank. a "neuron" is a (a) cell that moves information from the brain to other parts of the body (b) stem cell that has both an axon and a dendrite (c) cell that controls the fingers of a body (d) cell that makes up the spinal cord 4. some muscles in our body move without us telling them to. these are called involuntary muscles. some examples are the cardiac muscle cells inside the heart. these cells the heart relax and fill with blood. what is the best definition of "involuntary" based on the context clues? (a) something that happens on its own (b) trying hard to do something (c) something moving back and forth (d) easily moved

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.