A little trick i learnt: The atomic number reflects how many electrons there are, and there must be an equal charge. therefore, there are the same amount of protons as there are electrons. so if it has 81 protons, we look for number 81 in the periodic table, Thallium
Milkweed-Caterpillar-frog-bird
Answer:
A.
Explanation:
Because they move faster then warm fronts.
Doppler effect and redshift as the light coming from stars from the distance can be shifted in the same way as a pitch of sound does
