question 12 part a is hydrogen bonds
and 13 is because helium is a noble gas
hope it helps
Answer:
I would say maybe.
Explanation:
It literally depends on the environments and their surrounding. Also, it can genetic mutations. For example, my friend has greenish hazel eyes while her parents/grandparents don't (btw she's fully asian). This can be due to the environment surrounding her or the cause of genetic mutation. I do feel like genetic mutations are the ones causing us to evolve.
To explain furthermore, the environment can trigger or cause humans to evolve. For example, we all started in Africa, but do you ever wonder how white people became white people? Well, it's because of the cold climate around them. The Africans moved to Europe and stayed there for more than 100 years, and because of that their eyes, skin, lips became lighters.
Lastly, if you have not adapted to the environment around you, there's a good chance mutation and evolving will come along to help humans survive.
Answer: Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
Answer:
may be c is thw correct answer
1. courtship rituals 2. attract a mate 3. internal fertalisation occurs inside the feamales body whereas external fertalisation occurs outside the feamales body 4. <span>Gametes may get washed away 5. the devoloping zygote is protected</span>