Need help with my exam and only need the answers to the questions, no explanation needed. Thank you!

Question 20 (2.5 points)
________ bones are ones that have air spaces and struts so that they are lighter.
Question 20 options:
A. Pneumatic
B. Desiccated
C. Acellular
D. Hybrid
 

Question 21 (2.5 points)
What is the stele made up of and where is it located?
Question 21 options:
A. sclerenchyma in the epidermis
B. vascular tissue in the cortex
C. vascular tissue inside the endodermis
D. sclerenchyma in the exodermis
E. parenchyma in the cortex
 

Question 22 (2.5 points)
In gymnosperms, what structure contains the female gametophyte?
Question 22 options:
A. egg sac
B. egg capsule
C. archegonium
D. microsporophyll
E. micropyle
 

Question 23 (2.5 points)
Which of the following is the best description of the arthropod circulatory system?
Question 23 options:
A. pseudocoel regulated by a two-chambered heart with vasculature
B. hemocoel regulated by a tubular or single-chambered heart
C. pseudocoel with no vasculature and no regulation
D. hemocoel regulated by a three-chambered heart
E. hemocoel with no vasculature and no regulation
 

Question 24 (2.5 points)
Amphibians lay their eggs in moist environments to prevent ________.
Question 24 options:
A. dehydration
B. predation
C. premature metamorphosis
D. nutrient loss
 

Question 25 (2.5 points)
What is the name of the flatworm lineage that has members that are known as “chain worms” due to the results of their asexual reproduction?
Question 25 options:
A. Rhabditophora
B. Catenulida
C. Nemertea
D. Annelida
 

Question 26 (2.5 points)
The diaphragm separates the
Question 26 options:
A. pleural from the pericardial cavity
B. pelvic from abdominal cavity
C. ventral from dorsal cavity
D. abdominal from thoracic cavity
E. cranial from spinal cavity
 

Question 27 (2.5 points)
The volume of normal human blood is mostly composed of
Question 27 options:
A. erythrocytes
B. platelets
C. leukocytes
D. plasma
 

Question 28 (2.5 points)
How are the yucca moth and the yucca plant symbiotic?
Question 28 options:
A. moth is food for the plant and the plant provides a home to the moth
B. moth pollinates and plant serves as a nursery and food source
C. moth keeps off predators and plant provides food
D. moth pollinates and plant keeps predators away from moths
 

Question 29 (2.5 points)
What features do leaves of aquatic plants have?
Question 29 options:
A. wide lamina and thick waxy cuticle
B. narrow lamina and multiple epidermal layers
C. thin lignin cuticle and decreased guard cells
D. thick waxy cuticle and multicolored
 

Question 30 (2.5 points)
Cholecystokinin ________ stomach motility and inhibits gastrin release.
Question 30 options:
A. does not affect
B. increases
C. decreases