Explanation

Infectious diseases are caused by pathogens.

Pathogens of all classes must have mechanisms for entering their host and for evading immediate destruction by the host immune system.

Explanation

Calcium is the most abundant mineral in the human body, making up 1.5 to 2% of the total body weight.

Approximately 1,200 g of calcium is present in the body of an adult human; more than 99% of that amount is found in bones.

Explanation

Spiders, ticks, and mites belong to the class Arachnida.

They are characterized by having eight legs and a body divided into two main segments.

Explanation

Oximeter is used to measure the oxygen level in blood & heart rate. 

Pulse oximeters can be attached to your fingers, forehead, nose, foot, ears or toes.

The device may then be reused or disposed of.

Explanation

The statement that Cycas have vessel elements in their xylem is incorrect.

Cycas, like other gymnosperms, do not have vessel elements; instead, they have tracheids for water conduction.

Vessel elements are a characteristic of angiosperms (flowering plants).

Cycas are gymnosperms and produce seeds, but they do not form flowers, and their leaves are typically pinnately compound.

Explanation

The Earth rotates on its axis from west to east. Because of this, the Moon, the Sun and all other celestial objects appear to move from east to west across the sky.

Explanation

Bryophytes are a group of non-vascular plants, which include mosses, liverworts, and hornworts.

They are characterized by their lack of vascular tissue (xylem and phloem) and reproduce via spores instead of seeds.

Explanation

Methane is a chemical compound with the chemical formula CH4 (one carbon atom bonded to four hydrogen atoms).

*****

Explanation

Salt is a mineral composed primarily of sodium chloride, a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite.

Explanation

Hemophilia is an X-linked recessive genetic disorder that affects blood clotting

Since it is X-linked, it is more commonly expressed in males

because they have only one X chromosome, while females have two