Q: What is the ultimate source of energy for all life on earth? Choices: - its core - Mars - the moon - the sun A:
the sun

(Question)
Q: Like all chordates, vertebrates are animals with four defining traits, at least during which stage? Choices: - pupal - larval - adult - embryonic A:
(Answer)
embryonic

Ques: Q: After an adaptive defense is produced against a pathogen, typically plasma cells first secrete immunoglobin, which constitutes about ten percent of all what? Choices: - parasites - hormones - allergies - antibodies A:
Ans: antibodies

(Q).
Q: What are double sugars called? Choices: - monosaccharides - sodiums - silicates - disaccharides A:
(A).
disaccharides

Ques:Q: What substances are involved in most of the chemical reactions that take place in organisms, including digestion? Choices: - proteins - hormones - vitamins - enzymes A:

Ans:enzymes

Ques:Q: Over time, deposited sediments may harden into what? Choices: - coral - fossils - deltas - rocks A:

Ans:
rocks