Answer:
plasma
Explanation:
The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.
Plants began to appear around 470 million years ago. Dinosaurs became extinct about 65 million years ago, so thats not a choice. Prokaryotes first appeared on Earth almost 2 billion years ago, so thats not a choice either. Age of the Reptiles began about 252 years ago, so this could be a choice. Eukaryotes formed around 1.5 billion years ago, so probably not a possible choice. Based of the data I provided you, C is the most likely answer. Hope this helps!
Answer:
The first line of defence includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Explanation: