Which cell structure is found in plant cells but not in animal cells? a).cell membrane b).cell wall c).cytoplasm d).nucleus

B). Cell wall

Explanation:

a cell wall gives the plant cell its rigid box like shape, which animal cells do not have since they do not have cell walls.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

compass can be used day and night, cloudy or sunny