Answer:
There is no picture, but d seems the most likely.
They can estimate how old the universe is by testing rocks from different planets and comparing ages and comparing with our earth so since we know approximately how old are earth is we can tell how old the universe is
Answer:
Sunlight, water, and carbon dioxide
Explanation:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
The answer is the endogenous opiate.
The human body naturally produces its own opiates like substances and uses them as neurotransmitters. These substances include endorphins, enkephalins, and dynorphin, often collectively known as endogenous opioids. Endogenous opioids modulate our reactions to painful stimuli.
Answer:
The microscopic structural unit of compact bone is called an osteon, or Haversian system. Each osteon is composed of concentric rings of calcified matrix called lamellae (singular = lamella).
Explanation: