Answer: None of the above
(I and iv)
Explanation:
1.The reproductive system enables animals to create offspring.
2.Invertebrate animals exhibit a wide range of reproductive behavior, but the bottom line is that at some point during the process, <u>females create eggs</u> and males fertilize the eggs, either internally or externally.
Answer:
in the wall of the right atrium of the heart.
Explanation:
The sinoatrial node (SA), consisting of spindle-shaped cells, initiates the electrical activity of the heart. From its location in the right atrium in proximity to the superior vena cava, the electrical activity spreads to the atria, whose cells are larger than those of the SA.
Answer:
into nitrate which is the most usable form of nitrogen in the soil. Nitrate is absorbed by the roots of the plants, from plants nitrogen reaches to animals when they eat plants.
Explanation:
Answer:
the correct option is "D) They remain separate in the extremes of their ranges but develop a persistent hybrid zone in the area of overlap. "
Explanation:
the correct option is D since the mice are used to not crossing the river, the day it dries only one of them will dare to cross it, most of them instinctively will not cross it ...
On the other hand, in the area where both species of mice interpose, a new litter of mice will surely emerge where the genetics are combined, mice that are probably not suitable in the presence of aquatic environments and if in environments where drought predominates, which is very It is likely that if the drought continues and increases this genetic load it will benefit them.