Please with all of this

1. the circulatory system carries blood through your body. it consists of the heart ,blood vessels and blood

4. plant bring in carbon dioxide for the body to use and release oxygen as waste product

Step-by-step explanation:

1. The circulatory system consists of the blood the heart and the blood vessels.

2. The respiratory system brings in oxygen for the body to use and releases carbon dioxide as a waste product.

3. The muscular system permits movement of the body, maintains posture and circulates blood throughout the body. It consists of skeletal, smooth and cardiac muscles.

4. Plants bring air into their bodies using structures called stomata.

5. Fish take in air through gills and spiders take in air through tracheae

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

c

step-by-step explanation: