Sandy should've gave rap music to only one pea plant not all. The key problem was that all were being tested and one at least should not have been tested. She could change her experiment my only giving 1 planet rap music.
<span>A. Mammals use a closed, double-loop circulatory system aided by a four-chambered hearts.
The four chambered heart of a mammal is divided into two atria and two ventricles. Double-loop circulatory system is used. One loop for oxygenated blood, the other loop for deoxygenated blood.</span>
The number is 
.
<u>Explanation:</u>
We have , Four times the sum of a number and -3 is 4 more than times the number.Let's consider step by step as :
Let the number be x , Four times sum of a number & -3 is 
. Now, this is 4 more than times the number i.e 
. According to question these both statements are equivalent as :
⇒
⇒ 
⇒ 
⇒
Answer and Explanation:
Internal fertilization is characterized by sperm fertilizing the egg within the female. More protection against outside environments and predators, and therefore a higher chance of surviving until birth
. The young develop within the female, receiving nourishment from the mother’s blood through a placenta. Less chance of desiccation of gametes. Internal fertilization also enhances the fertilization of eggs by a specific male since the females are more selective of their mates thus increasing chances of gametes meeting
. Even though fewer offspring are produced through this method, their survival rate is higher.
A signaling pathway would need to be regulated because of efficiency, to make what you need when you need it.
Hope this helps!
