A tube-like gadget called a spacer can help kids or people with trouble breathing use an HFA more easily. Dry powder inhalers (DPIs) require you to breathe in quickly and deeply. That can make them hard to use during an asthma attack when you canât fully catch a deep breath.
Some jellyfish are clear and can look like a plastic bag in the water. Others are in vibrant colors such as pink, yellow, blue, and purple, and often are luminescent.
Jellyfish and their relatives such as the Portuguese man-of-war are mobile, either actively swimming or pushed by winds and currents. Both stationary and mobile members of this group have radial symmetry with body parts radiating from a central axis. This allows jellyfish to detect and respond to food or danger from any direction. Jellyfish have an outer layer which covers the external body surface, and an inner layer which lines the gut.