Sand dollars, clams, and sand crabs usually live in
a. salt marches.
b. tide pools.
c. rocky shores.
d. sandy shores.

Option D, sandy shores

Explanation:

On a sandy beach, the movement of sand does not allow the survival of large plants and animals .  Thus, plants like seaweeds, visitor animals or small organisms which are able to live beneath sandy  soil of beach  survive in a moving landscape. Sand dollars, clams, and sand crabs live in the submerged beach section of a marine beach.  They all feed on plankton and small organic particles found on the sand . They remain half buried during normal sea wave  while during stormy condition they dig deep into the sea shore.

Hence, option D is the right choice of answer

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."