No, 4K resolution is not only available for YouTube premium members. YouTube offers 4K resolution videos to all users, both free and premium. However, the ability to stream videos in 4K resolution may depend on the device being used and the internet connection speed. Some older devices or slower internet connections may not support 4K streaming. **

The phrase "Did it only occur to me?" suggests that the speaker is questioning whether they are the only one who has realized or thought about something. It implies a sense of surprise or disbelief that others may not have noticed or considered the same thing. This phrase can be used to express frustration or astonishment at being the only one to recognize a particular idea or issue. **

No, photosynthesis does not only occur in leaves. While leaves are the primary site of photosynthesis in most plants, other green parts of the plant such as stems and unripened fruit can also carry out photosynthesis. Additionally, some aquatic plants can perform photosynthesis in their submerged parts, such as their stems or even their roots. Overall, photosynthesis can occur in any green tissue that contains chlorophyll and is exposed to light. **

Anisocoria occurs only sometimes in situations where there is a difference in the size of the pupils due to changes in lighting conditions. For example, one pupil may appear larger than the other in dim lighting but return to normal size in brighter light. This fluctuation in pupil size can also occur in response to certain medications or drugs that affect the muscles controlling the pupil size. In these cases, anisocoria is not a constant condition but rather a temporary or intermittent occurrence. **

Some of the anime that are exclusive to Crunchyroll Premium include "Attack on Titan," "One Piece," "My Hero Academia," "Demon Slayer," and "Naruto Shippuden." These popular anime series are only available to watch on Crunchyroll with a Premium subscription, making it a desirable platform for anime fans. Additionally, Crunchyroll also offers simulcast of new episodes for many ongoing anime series, giving Premium subscribers early access to the latest episodes. **

Rape is a term typically used to describe non-consensual sexual activity between humans. However, in the animal kingdom, there are instances of non-consensual mating behavior that could be considered similar to rape. For example, in some species, males may force themselves on females without their consent. This behavior is often observed in certain species of ducks, dolphins, and primates. It's important to note that the concept of consent and the social and ethical implications of rape are specific to human society and may not directly apply to the behavior of animals. **

Crossing-over, also known as genetic recombination, always occurs during meiosis. This process involves the exchange of genetic material between homologous chromosomes, leading to genetic diversity in offspring. Crossing-over does not occur during mitosis, as this type of cell division does not involve the pairing of homologous chromosomes. **

Oxygen occurs as O2 because it is a diatomic molecule, meaning it naturally exists as a pair of oxygen atoms bonded together. This bond is very stable and requires a significant amount of energy to break, which is why oxygen is typically found in this form in the Earth's atmosphere. Additionally, the O2 form of oxygen is more energetically favorable compared to other possible forms, such as O3 (ozone) or O (atomic oxygen). **