All mammals (except a few) have __________ cervical vertebra.

In all connective tissues except_____, the cells secrete fibres of structural proteins called collagen or elastin.

Desert lizard lack the physiological ability that mammals have deal with the high temperature of their habitat, but manage to keep their body temperature fairly constant by :-

Do all variations in a species have equal chances of surviving in the environment ? Why ?

A system is pushed by a force F as shown in figure All surfaces are smooth except between B and C is mu . Minimum value fo F to prevent block B from down ward slipping is

Given below are a few statements related to external fertilization. Choose the correct statements. (i) The male and female gametes are formed and released simultaneously. (ii) Only a few gametes are released into the medium. (iii) Water is the medium in a majority of organisms exhibiting external fertilization. (iv) Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism. (A) iii and iv (B) i and iii (C) ii and iv (D) i and iv

Through (A)____ and (B)____ kingdoms have been a consta under all different systems, the understanding of what group organisms be included under these kingdoms have been changing the (C)____ and (D)_____ of other kingdom have also been understood differently by different scienitits over time.

Which of the following is correct: (a) Cells of all living organisms have a nucleus. (b) Both animal and plant cells have a well defined cell wall. (c) In prokaryotes, there are no membrane bound organelles. (d) Cells are formed de novo from abiotic materials.