Which of the following statements is incorrect?a. Sebaceous glands are attached to hair follicles and secrete sebum which protects and lubricates skin. b. Sudoriferous glands release perspiration into hair follicles or onto the surface of the skin through pores. c.Ceruminous glands produce a waxy substance which protects the genitals."d. All of these statements are correct.

The correct answer is option c. "Ceruminous glands produce a waxy substance which protects the genitals".

Explanation:

It is incorrect that ceruminous glands produce a waxy substance which protects the genitals. The ceruminous glands are not located in the genital area, ceruminous glands are specialized sudoriferous glands located in the the external auditory canal. A normal ear have between 1,000 and 2,000 ceruminous glands, which produce the ear wax that protects this zone.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!