Which is an example of pseudoscience?

Pseudoscience can be harmful. For example, pseudoscientific anti-vaccine activism and promotion of homeopathic remedies as alternative disease treatments can result in people forgoing important medical treatment with demonstrable health benefits.

Explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

they are made of gases.

they have a spherical shape.

they make energy through fusion.