I think the hydra lacks the specialized cells for touch and chemical detection. On the other hand earthworms have touch, light, vibration and chemical receptors along the entire body surface. Both of them are invertebrates (those animals without a backbone), they include insects, worms, jelly fish, spiders among other animals.
Answer:
Energy releasing reaction = exergonic reaction (negative G) is more likely to be spontaneous.
Explanation:
Exergonic reactions do not need any input of energy, and therefore are happening spontaneously. On the other hand, endergonic reactions need an energy input. These reactions are often paired = coupled reactions.
Hope this will help :)
Birds were a major widespread during this time period therefore the answer is the last option
Answer:

Explanation:
If flies that are heterozygous for all three traits are crossed; e.g HtHtHt crosses with HtHtHt. The proportion of the offspring that would be expected to be heterozygous for all three traits will be: 1/8 because 50% (0.5) of their offspring will be heterozygous for just one trait. Therefore for three traits; we have (0.5)³= 0.125
0.125 is equivalent to 
From the table, the area of the asterisk region illustrate the traits that are heterozygous in the offspring.
= 
= 
The answer you are looking for is C